My Markbass LMII fell out of the boot of the car onto the tarmac when unloading for a showcase gig (playing 4 or 5 songs only with no PA support for backline, so didn't bother bringing a load of backup gear). It was in a padded gig bag and appeared to be okay. PLugged in and all okay, however, about 3 or songs in, the volume just disappeared. Turned it off and on again, nothing. Turned off, unplugged, plugged in, turned on and volume came back, only to go again moments later. All the while, rest of the band still playing. Had to flag them down to stop. The guy running PA runs over and plugs my pedal board direct in the PA (no DI box, just literally straight into the desk from my jack lead, and saves the set.
I put it down to dodgy power in the venue and forcing the amp to go into protect mode, but that drop still played on my mind. Tried the amp again at rehearsal and was fine for a couple of hours, then it went again. Turned it off for a few minutes and came back to life, only to go again. So I knew it was damaged. Took it to a repairer who initially couldn't find anything wrong with it, but it eventually stopped working after a few hours for them too. Had to pay nearly £200 for a complete new logic board and components as the damage was likely microscopic and untraceable (the downside of modern class D microamps).
It now appears to work fine, but I don't completely trust it, knowing that it failed on me. So I bought a new amp and relegated the markbass to backup duty. Generally, it stays at home, as I have a Harke Bass Attack pedal that I can use as a DI, but if the gig is a fair distance from home, I will bring it with me, just in case.
I'm now considering getting a Helix, which will do double duty as my bass amp tone and DI so it doesn't matter what amp I use on stage. I could even go smaller with a combo. Until lately, my bass amp has been supplying the room sound, but as the two guitarists have the Helix too, we are considering going ampless at some gigs anyway. If anything, my amp will just be a stage monitor.