wtf what provider is this? I used cellular internet for a year with remote desktop for work, so this is shocking to me.
But they've managed capacity disastrously in my area recently. For the last three months. Where I live, and other parts of the centre of town, every day for about 4 hours from 11am to 3pm, it goes offline most of the time, so the network is unusable. It's impossible to work - can't even do chat or an audio meeting.
When I ran ping, I found it wasn't really offline sometimes. Sometimes it was just such high latency and/or packet loss that it may as well be. Signal strength was good, and voice calls worked fine.