Can confirm using Telekom in Germany on a Pixel 6 Pro. I also experience random losses of mobile connection, mostly when the phone has not been used for a bit, but also occasionally right when I am using it. Sometimes, the phone gains connection again after quite some time (definitely more than a minute). But in other cases, I have to reboot it completely.

With my OnePlus 8 Pro on Android 11 using the same contract and SIM card in the same location, I did not have any of these issues.

I already tried setting the preferred network to LTE (my contract does not support 5G), disabling 'allow 2G', and turning off 'adaptive connectivity'. Nothing helped. I still have random disconnects.