re-level it? When you home the Z bed it should hit the switch on the bottom, breifly go up and then down a second time and either stop or then go up.
If it slams into the bottom and makes a terrible racket then your Z switch isn't triggering.
If it never goes all the way down then the Z switch is probably stuck closed.
Issues about the home height probably mean you lost your "level" or you didn't calibrate it yet. It's pretty easy to find among the menus as it's one of the only 4 or so menus UM seems to want you to be able to find quickly (level bed, print, change filament).
Have you tried recalibrating it? Perhaps the firmwares settings got lost/reset and it simply needs a new calibration run.
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