Model :

Hardware Version :

Firmware Version :

ISP :

Greetings,
I have just get the router model TD-W8961N(IT) ver. 2.0 with the last firmware available to download and with all my ISP settings (VPI 8, VCI 35, PPPoE LLC) the connection is very unstable: very often the ping increase with time over 2000ms and cause timeout from the website, i reveive an error on the log attached below

1/1/2000 0:0:30> bridge only stop
1/1/2000 0:0:30> SNMP TRAP 3: link up
1/1/2000 0:0:30> Quick bridge not allow multi-channel
1/1/2000 0:0:30> bridge only stop
1/1/2000 0:0:30> SNMP TRAP 3: link up
1/1/2000 0:0:33> PPPoE: Send PADI
1/1/2000 0:0:33> PPPoE: Recieve PADO
1/1/2000 0:0:33> PPPoE: Send PADR
1/1/2000 0:0:33> PPPoE: Recieve PADS
1/1/2000 0:0:34> PAP Authentication Successful
1/1/2000 0:0:34> ppp_ready: ch:804dd6d4, iface:804041c8
1/1/2000 0:0:34> PPP get IP Address:93.148.69.219
1/1/2000 0:0:34> PPP gateway:192.168.12.1
1/1/2000 0:0:34> PPP subnetmask:255.255.255.255
1/1/2000 0:0:34> PPP primary DNS:91.80.37.100
1/1/2000 0:0:34> PPP secondary DNS:91.80.36.136
1/1/2000 0:0:34> SNMP TRAP 3: link up
1/1/2000 0:0:34> Accept() fail
1/1/2000 0:0:38> Last errorlog repeat 1 Times
1/1/2000 0:0:38> netMakeChannDial: err=-3000 rn_p=80485e40
1/1/2000 0:1:6> Last errorlog repeat 169 Times
1/1/2000 0:1:6> sending request to NTP server(45)
1/1/2000 0:1:7> netMakeChannDial: err=-3000 rn_p=80485e40
1/1/2000 0:1:7> Last errorlog repeat 1 Times
1/1/2000 0:1:7> received from NTP server(46)
11/19/2017 15:43:52> Adjust time to 5a11a6b8
11/19/2017 15:43:52> adjtime task pause 1 day
11/19/2017 15:43:52> netMakeChannDial: err=-3000 rn_p=80485e40

Here other settings: http://prntscr.com/hcgdvz

what can I do for to have a stable internet connection?
My ISP is TELETU

Thank you
Regards
Andrea