Wifi working but ethernet doesn't work

Messages
1
Location
Mumbai
ISP
Airtel
I have Airtel Xstream Fiber with Nokia 140 ONT. I have 2 LAN cables with one connected to PC and one to an old router which I am using as a AP in a different room. However, both devices are not working. Wifi works flawlessly. Sometimes, when I put the LAN1 and LAN2 mode to Bridge (and restart) and putting Bridge to Route mode makes it work. But the internet connectivity lasts only for about 4-5mins.
These LAN cables were crimped by me, but I am certain that it could not be an issue because it has been working fine since about a year.

Any help would be appreciated.
 

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