TP Link Archer C6 V3.2 loses Internet connectivity every 10-15 seconds
I have an Archer C6 v3.2 (3 months old) connected to my ISP's Nokia ONT/wifi router through bridge mode on the Nokia ONT. The Archer C6 connects through PPPoE. I have been using this config for the past 3 months and it was working fine. 3 days back the Archer C6 will disconnect from the internet (PPPoE connection) every 10-15 seconds and will reconnect. Light gos orange and green multiple times.
The connection on the Nokia ONT/ Wifi router is stable and I am now having to use that as backup.
I have tried doing a factory reset, upgradng the firmware to the latest on the TP link site, changing the LAN cable (Lan 4 to WAN port on the TP Link). However the issue persists. I would be happy to attach a syslog as I am unable to make much sense of it. There have been no other changes to the ISP setttings on the Nokia ONT modem.
PLease assist.
PS: I also notice that devices connected to the Wifi on the Archer C6 (2.4GHz or 5GHz) will use up more battery compared to when I was using the WR841N. I had 3 android devices connected to the router and am facing this issue on all 3 (approx 4-5% used through the day).