Just happened again (total freeze needing an off-on, no access to router via ethernet) with 5200 bandwidth limit. Will try now with 5000 (official bandwidth contract) and if it happens again i will try with an external modem and configure the 8980 in router only.

EDIT: during freeze the leds were blinking (like everything ok) and I wasn't downloading at max speed.

@all: have you tried to disable SRA in DSL settings ?
I found that in an other forum:
Bitswap should be enabled and SRA should always be disabled since few Aussie ISPs use it and it will drop line sync over time instead of retraining the connection and can sometimes cause issues.
SRA can be buggy depending on hardware used on the ISP's and customer's ends as well as configuration of said hardware. Many ISPs have experimented with SRA but disable it to eliminate it as a potential issue.

I'm testing now ...

freeze ...
boring !
for the 2nd time it freezed just after terminating a torrent file download.
now testing with upnp off (last test, after that I try with external modem)

The controllers respond to transients. The router in question follows the response without any limiting hence the temp disconnect. If the download is a torrent download, then torrent software has capability to restrict downloads. Remember torrent download restriction can be on the total as well as the thread. So factor in that simultaneous downloads could suddenY add up.

I use bandwidth limitation with my torrent client (tixati) and I was downloading slowly.
Since yesterday at night I turn off UPNP (as seen as a recomandation on a lot of routeurs in these forums) and for now ... no freeze ... Let's wait a bit ....

My old DLINK DIR615 from 2009 was able to stay ON for months without any crash, with a ddrt firmware.

Just freezed with UPNP off ....
Now testing with an external ZTE modem

Now I can say the guilty for "over" heating is the modem chip.

Im getting the exact same issue. I have tried everything over the last few months, switching off upnp etc too. I was beginning to think it was my ISP Zen. It happens when im downloading big files or trying to play certain games. GTA V for example is too much for this router when online























































































































































































































































































































































































































































































































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[TABLE="class: bdr XXL"] [TR] [TD="class: tc"]5	2015-09-09 12:41:05	PPP	Information	ppp0 rcvd [IPCP ConfAck id=0x2
6	2015-09-09 12:41:05	PPP	Information	ppp0 sent [IPCP ConfReq id=0x2
7	2015-09-09 12:41:05	PPP	Information	ppp0 rcvd [IPCP ConfNak id=0x1
8	2015-09-09 12:41:05	PPP	Information	ppp0 sent [IPCP ConfAck id=0xa5 ]
9	2015-09-09 12:41:05	PPP	Information	ppp0 rcvd [IPCP ConfReq id=0xa5 ]
10	2015-09-09 12:41:05	PPP	Information	ppp0 sent [IPCP ConfReq id=0x1 ]
11	2015-09-09 12:41:05	PPP	Information	ppp0 rcvd [CHAP Success id=0x1 "CHAP authentication success, unit 2774"]
12	2015-09-09 12:41:05	PPP	Information	ppp0 rcvd [LCP EchoRep id=0x0 magic=0x66c49eab]
13	2015-09-09 12:41:05	PPP	Information	ppp0 sent [CHAP Response id=0x1 , name = "zen149048@zen"]
14	2015-09-09 12:41:05	PPP	Information	ppp0 rcvd [CHAP Challenge id=0x1 , name = "dsl4.wh-man"]
15	2015-09-09 12:41:05	PPP	Information	ppp0 sent [LCP EchoReq id=0x0 magic=0x8d456cc]
16	2015-09-09 12:41:05	PPP	Information	ppp0 rcvd [LCP ConfAck id=0x2 ]
17	2015-09-09 12:41:05	PPP	Information	ppp0 sent [LCP ConfAck id=0x1d ]
18	2015-09-09 12:41:05	PPP	Information	ppp0 sent [LCP ConfReq id=0x2 ]
19	2015-09-09 12:41:05	PPP	Warning	ppp0 LCP down
20	2015-09-09 12:41:05	PPP	Error	ppp0 LCP down
21	2015-09-09 12:41:05	PPP	Information	ppp0 rcvd [LCP ConfReq id=0x1d ]
22	2015-09-09 12:41:04	PPP	Information	ppp0 rcvd [LCP EchoRep id=0x0 magic=0x66c49eab]
23	2015-09-09 12:41:04	PPP	Information	ppp0 sent [CHAP Response id=0x11 , name = "zen149048@zen"]
24	2015-09-09 12:41:04	PPP	Information	ppp0 rcvd [CHAP Challenge id=0x11 <7383c8a505566eaf5759edaddd605980>, name = "ERX21.Edinburgh4"]
25	2015-09-09 12:41:04	PPP	Information	ppp0 sent [LCP EchoReq id=0x0 magic=0x62134eb4]
26	2015-09-09 12:41:04	PPP	Information	ppp0 rcvd [LCP ConfAck id=0x1 ]
27	2015-09-09 12:41:04	PPP	Information	ppp0 sent [LCP ConfReq id=0x1 ]
28	2015-09-09 12:41:03	PPP	Information	ppp0 sent [LCP ConfAck id=0x61 ]
29	2015-09-09 12:41:03	PPP	Information	ppp0 rcvd [LCP ConfReq id=0x61 ]
30	2015-09-09 12:41:01	PPP	Information	ppp0 sent [LCP ConfReq id=0x1 ]
31	2015-09-09 12:40:40	PPP	Error	ppp0
32	2015-09-09 12:40:40	PPP	Error	ppp0 User request
33	2015-09-09 12:40:38	PPP	Information	ppp0 sent [LCP TermAck id=0xd2]
34	2015-09-09 12:40:38	PPP	Information	ppp0 rcvd [LCP TermReq id=0xd2]
35	2015-09-09 12:40:36	PPP	Information	ppp0 sent [LCP TermAck id=0x46]
36	2015-09-09 12:40:36	PPP	Warning	ppp0 LCP down
37	2015-09-09 12:40:36	PPP	Error	ppp0 LCP down
38	2015-09-09 12:40:36	PPP	Information	ppp0 rcvd [LCP TermReq id=0x46]
39	2015-09-09 12:35:22	PPP	Information	ppp0 rcvd [IPCP ConfAck id=0x2
40	2015-09-09 12:35:22	PPP	Information	ppp0 sent [IPCP ConfReq id=0x2
41	2015-09-09 12:35:22	PPP	Information	ppp0 rcvd [IPCP ConfNak id=0x1
42	2015-09-09 12:35:22	PPP	Information	ppp0 sent [IPCP ConfAck id=0x3 ]
43	2015-09-09 12:35:22	PPP	Information	ppp0 rcvd [IPCP ConfReq id=0x3 ]
44	2015-09-09 12:35:22	PPP	Information	ppp0 sent [IPCP ConfReq id=0x1 ]
45	2015-09-09 12:35:22	PPP	Information	ppp0 rcvd [CHAP Success id=0x1 "CHAP authentication success, unit 1090"]
46	2015-09-09 12:35:22	PPP	Information	ppp0 rcvd [LCP EchoRep id=0x0 magic=0x706b7246]
47	2015-09-09 12:35:22	PPP	Information	ppp0 sent [CHAP Response id=0x1 <7b3e609b072569a8ac38884d5463a555>, name = "zen149048@zen"]
48	2015-09-09 12:35:22	PPP	Information	ppp0 rcvd [CHAP Challenge id=0x1 <5196f74efe078efc5ccf1080066003f0>, name = "dsl4.wh-man"]
49	2015-09-09 12:35:22	PPP	Information	ppp0 sent [LCP EchoReq id=0x0 magic=0x81eb7723]
50	2015-09-09 12:35:22	PPP	Information	ppp0 rcvd [LCP ConfAck id=0x2 ]
51	2015-09-09 12:35:22	PPP	Information	ppp0 sent [LCP ConfAck id=0x45 ]
52	2015-09-09 12:35:22	PPP	Information	ppp0 sent [LCP ConfReq id=0x2 ]
53	2015-09-09 12:35:22	PPP	Warning	ppp0 LCP down
54	2015-09-09 12:35:22	PPP	Error	ppp0 LCP down
55	2015-09-09 12:35:22	PPP	Information	ppp0 rcvd [LCP ConfReq id=0x45 ]
56	2015-09-09 12:35:22	PPP	Information	ppp0 rcvd [LCP EchoRep id=0x0 magic=0x706b7246]
57	2015-09-09 12:35:22	PPP	Information	ppp0 sent [CHAP Response id=0x9e <97cfef1c24a2e47e07499a043672b188>, name = "zen149048@zen"]
58	2015-09-09 12:35:22	PPP	Information	ppp0 rcvd [CHAP Challenge id=0x9e <6e84a63e9600c46c95af318efdb449e1>, name = "ERX21.Edinburgh4"]
59	2015-09-09 12:35:22	PPP	Information	ppp0 sent [LCP EchoReq id=0x0 magic=0x71968607]
60	2015-09-09 12:35:22	PPP	Information	ppp0 rcvd [LCP ConfAck id=0x1 ]
61	2015-09-09 12:35:22	PPP	Information	ppp0 sent [LCP ConfReq id=0x1 ]
62	2015-09-09 12:35:20	PPP	Information	ppp0 sent [LCP ConfAck id=0xd1 ]
63	2015-09-09 12:35:20	PPP	Information	ppp0 rcvd [LCP ConfReq id=0xd1 ]
64	2015-09-09 12:35:19	PPP	Information	ppp0 sent [LCP ConfReq id=0x1 ]
65	2015-09-09 12:34:57	PPP	Error	ppp0
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Since I made a hard-reset and reconfigured manually (without loading conf file), I'm not having issue anymore. Try that !

for me the hard-reset and manual configuration not solved.