Apologies if my post title is not accurate enough, and thanks for the help in advance!

Currently have 2 other separate routers (let's call it A and B for simplicity) connected to a central router that is connected to a modem, one of the separate routers (A) keeps having the orange internet light (every other day), however, the internet from the central router and the separate router (B) are both working fine.

Typically, the issue can be resolved by restarting the central router. However, as this issue is getting more frequent, thus any help would be appreciated. Router A has recently been replaced as I initially thought it was issue that the previous router A was too old (roughly 8 years or so). Thus am now wondering if it might be an issue with the cable wiring to the eternet port at router A.

Router A: TPlink AX10 ; I have utilised most if not all the fixes provided by Tp Link (cloning WAN address, updating the software, etc.)

TLDR, need help as to why only one router (router A) keeps having an orange internet light despite the main router and router B being fine.

Thanks again for the help provided!