Earlier quoted context omitted.
Every couple of weeks one of my internet connections (here in India) slows down dramatically. I used to call and complain, and my ISP would say they would "reset my account" which always brought things back to normal. For months I tried to persuade them to find and fix the underlying problem. Now I just call and ask if they can reset my account, please.
In Eastern Europe I use 4G home internet when visiting my parents' village house. Every week like clockwork, the quality will drastically decrease from the usual 100 Mbps, on Saturday to 40 Mbps (minimum for the package) and Sunday to 10 Mbps. This will remain forever on 10 Mbps, even on Monday at 4am. The only fix was to call the support line on Sunday and ask for a "network reset". Since this is a home internet, it…
I also had intermittent disconnection issues with the same ISP that they fobbed off with "maybe your WiFI is bad/has interference" or "you may be running other processes that are saturating the network connection". I had no devices with ethernet ports so I bought a USB ethernet adapter, booted up a barebones linux dist, ran a script that tried to connect to an upstream server, plotted a graph (which showed a disconnection every 20 minutes) and presented that to them. To their credit they admitted there was a problem and moved my microwave antenna to another tower. (For all I know the former tower still has that issue)