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 is bound to the cell tower and it is drastically deprioritized elsewhere. The reset deletes and re-adds the device to my tower and sets the tower as the SIM card's home cell.
This was annoying but bearable, I got good at quickly calling and getting it done.
Except starting two weeks ago they refuse to do it, saying they're "not allowed to" anymore. No amount of persuasion helped.
They will report a technical problem and the support people will close it as resolved with a braindead blah response "maybe your signal is bad" or "maybe the tower is busy with traffic". Very sad.
These days I just change the IMEI if the modem and that seems to fix it... For a while.