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Solved
WiFi Range Extender Kills ARRIS Cable Connection
Our internet is provided by our cable company. The cable goes from the wall though a splitter into a cable box/gateway and a modem/router. The cable box/gateway and modem/router are also connected by...
Looks like problem fixed. Following advice seen here and elsewhere, I upped the IP lease time on the router from default 1 hour to a couple of days. No real idea why this works but no crashes for 3 days now.
Lots of calls to cable company (ISP) and extender manufacturer accomplished nothing. So I tried something from a Google search and the problem has gone away so far (12 hours and counting).
I set the extender to static IP and set IP to 192.168.0.10. I think this may have been the default.
Then went to router and saw it was set to generate IPs of 192.168.0.1 to 192.168.0.254 (I think). I changed the lower bound to 192.168.0.11 so that it would not overlap with the extender.
So far so good, but honestly not sure whether I made a difference, or whether fix will last.
Nope. Cable box went back out after 19 hours. A new record, but still out.
Looks like problem fixed. Following advice seen here and elsewhere, I upped the IP lease time on the router from default 1 hour to a couple of days. No real idea why this works but no crashes for 3 days now.