I am with you. My SP4 works fine except occasional driver crashes, which hopefully will be resolved soon. Once in a blue moon I have the black screen issue coming out of sleep, but again, should be fixed with firmware.
If you have "tons" of various issues, my first suggestion is RESET the OS, update and try again. Also, in a previous post I mentioned outstanding issues and temp workarounds until resolved; i.e. comes out of sleep and get hot.
Overall, I'm happy but yes, if you doing a reset and the workarounds still do not resolve your issues, could be HW related and an exchange might be warranted. ****, even Apple is having issues with the iPad Pro. Unfortunately, it is the world we live in
now days, quality control has gone to ****.
Think about it, if you're old enough that you have a tube TV they would last 30 years. Anyone have a TV made in the last 10 years that is still working? I know I have gone through 2 different TVs that were only 6 and 7 years old.