The router falls every few days and the problem is not from the ISP or infrastructure side
After a month of continuous tracking on the falls.

Today I did not have the option to access the router interface at all by accessing 192.168.1.1
But the lights on the router showed that there was a connection to the network and everything was fine.
I plugged in another router and everything worked normally.
After infinite restarts the interface returned with the Internet connection.

What can cause the problem of the router that disables the Internet on my home almost on a daily basis?