mine was slightly unlevel. i gently warped it by hand to make it level
Doesn't it bother you that you spent so much on a machine and have to bend it to make it level? I would be terrified to do that!
Mine doesn't wobble on my desk, lap desk, or dining room table.
Took it to two meetings the last two weeks (two different boardrooms) and it wobbled on their tables. I thought, "what the hell" and wondered if it was damaged in transit. Nope. Still stable and unmoving on my desk.
I'm going to go with that some surfaces, even if they LOOK flat and smooth, really aren't. I'd try a couple of different places before I'd say 100% that your computer has a real stability issue.