I am not sure what to tell you regarding the problems with the PIN keyboard. Maybe you are using an unusual screen resolution, You could try to change it to see if it helps. Regarding the disconnection problems, try using a VPN and see if that will make it better.

Trezor Suite is a relatively new software. Similar to Ledger Live, I am sure some people experience glitches and bugs, while others have a flawless experience. Anything could affect that. Hardware or software configuration, faulty drivers, corrupted installation... I remember reading posts of people who had to abandon Ledger Live because after one update it simply crashed and they could never open it again. Other users didn't have such problems and it works just fine for them.