Stereo & Electronics - factory stereo n power windows stop working

Hi,
for the past few months my stereo will go blank and both power windows stop working. Door locks and everything else works. Usually shuts off or turns back on after hitting smalls bumps/crevaces in the roadway. It is annoying when i want to hit a drive thru or toll booths. TIA

most likely loose power or ground to RAP or BCM (depending on year)

much more common than you would think

forgot to say it's a 99 Z28 so it must be BCM related.Thanks