What can be wrong with the router - do you need to reboot periodically to work?

Question

Linksys

At home, I use several providers and have several wifi routers. One of the Linksys WRV200 routers has been working for about 7 years. And in the last six months - a year the following problem has been observed with it - all wireless and wired clients are connected to it, but there is no Internet access. I turn off / turn on the router from the power supply, Internet access appears. The frequency of such a problem is about once every 2-3 days. Terribly annoying. Before that, for about 6 years, I don’t remember that such a thing happened with this Lynksys in principle.
The power is connected through the UPS, I disassembled the router itself to inspect for visible damage, but there are no problems in appearance. The power supply of the router gives out 1A on the tester, I tried to change the power supply to a similar one (I have two such routers), but it did not help. I tried five times to reset all settings through the Reset button and through the standard web-menu - the problem remains.
1 computer and 1NAS Synology are connected by wire to the router.
What theoretically could be the problem with this router?

Answer 1

7 years? It's just that his time has come.

Answer 2

You open and change all the electrolytes for nutrition + the same thing in the power supply.
You most likely have power problems, it is also desirable to change the flash drive (I don’t remember which one it is, but most likely 8mb, something from the 25th series).
Well, clean the dust and cockroaches is sacred :)