When I was trying to convince my employer to let me work remotely, I was surprised to find there are reasonably priced dual-wan switches with failover.
Combine a dual wan / failover device with two different internet services, and for $120 a month you probably will rarely have timeouts. Around here, cable costs about $65 for 600MBps, and DSL is about $40.
I don’t know about you, but I’ve found my technical abilities rarely accomplish what I want when I’m trying to move a mountain. In this case, one internet user’s lag isn’t worth much trouble.
I’ll counter myself with an anecdote: I had the same connectivity issues as you- sudden dropouts for a minute, then back up.
I tried multiple cable modems, multiple Wi-Fi routers. After calling and asking for help, 2 days later techs arrived. The culprit?
The CATV line coming to my property was incorrectly installed, supposedly letting part of the liquid in the cable deep into the coupler. (Hey, the tech said it- not me!)
And now the internet is up!