I have constant DSL drop-offs - same as many other users describe in their respective threads. One day all good, the other - fifteen drops in a couple of hours (had more than 30 in 4 hours just recently).

The hybrid DSL / LTE fallback that is supposed to switch to cellular when DSL drops, works about thirty percent of the time only with the remaining two thirds - connection reset cycles lasting about 3 minutes on average.

Wifi network is not available during a drop. Further, many devices (TV, streaming device, Google Home) need to be restarted after the router 'recovers' the DSL connection. Quite often even that doesn't help and a full reboot of the router along with all devices on the home network is required.

I had several Telekom technicians come to check the landline only to find it excellent. Different routers, cables, settings - to no avail. It appears Telekom is unable and, what is more important, unwilling to resolve issues. Or maybe it's just their notion of quality.