There are many indications for router failures ( bad connection, high line attenuation, bad snr margin) but all this can be caused by bad infrastructure. Is there a method to test the router's health?
An example of a bad looking router panel on a 15M plan:
1 Answer
A) To verify that the router's modem (including cable) is ok and just the line is bad: testing at a different place is the only chance to do that
B) but as your goal is not the router itself but a stable internet connection:
only trying a different (if possible newer) router at your place without improvement will convice the ISP to further investigate.
Buying/borrowing are not the only ways to do that: if you exchange routers with a friendly neighbor for example, you will get results for A) and B) at the same time.
