Link DOWN - Losing connection with the router

[MT97]

Hi Folk,
I've owned this router (RT-AC86U) for few years now running it with the merlin firmware. Recently and for a month now i've been dealing with a complete disconnect from the PC to the router via Ethernet and it always happens when you don't expect it to, in other words, randomly. Nothing changed in my setup, it just all happened randomly. I've tried another ethernet port and updated the merlin firmware but the issue persist and i can't troubleshoot something that happens randomly but not frequently. I've attached the logs at the time of the DC, please send help, absolutely losing my mind with this one.

Any help will be appreciated

 

[tgl]

I'm wondering about a flaky ethernet cable --- they do go bad sometimes for no apparent reason.

 

[sfx2000]

I'm wondering about a flaky ethernet cable --- they do go bad sometimes for no apparent reason.

Considering the age, and the common issues - the AC Adapter would be a consideration here...