JD15Sierra

Anybody find any other solutions to this problem? I have a '15 GMC Sierra 1500 SLT and mine started doing this a couple years ago when it was under warranty so I had the dealer take care of it. The service writer didn't know what the fix was when I picked it up after asking. Now the truck is not under warranty and it is doing it again. The strange part is that it only happens when I hit a bump and goes away right after. I checked all the grounds and they are tight and I also wired in the 2200 ohm resister but that didn't fix it.