Sounds like you got a lemon. I also have an X1 carbon, and it's been a great upgrade for me. My biggest complaint is the eraser isn't as easy to use as my old toshiba. The eraser is important to me -- my hand gets numb using a trackpad.

Previously my daily driver was a Thinkpad X1 Gen 6, it's a bit of troublesome.

Now it's X1 Gen 10, it has been largely trouble free.

Probably my next laptop will be the next Gen X1 with the new upgradeable LPCAMM2 RAM.