multiple modem failures

Over the weekend, both my original modem and replacement modem failed. Noticed degraded signal on Saturday for the original, did several resets and contacted Assistant (which did nothing, what a horrible, useless program). Did a hard reset and it stopped working entirely. Sunday morning, got a replacement modem, it started with good speeds but degraded over the afternoon until it was also nonfunctional by the end of the day. Could only get a tech appointment next Friday/Saturday - is there any way to get actually useful troubleshooting or a tech appointment that isn't the full work week away? I need to work from home and hotspot is not cutting it.