I got one of these one day where the bed drives up into the head, deflects the springs and buzzes the stepper, system halts with Probe Failure error message and Reset button on the LCD dialog. The printer worked after that. The next day I got a couple of these failures and couldn't print. Not finding anything on the forums or web I put in a tech support ticket and was told they'd email me in TWO DAYS. Not happy about that with a dead printer sitting here. I decided to look for loose wires or dirt or ? I didn't find anything but I did brush off the sensors under the head with a soft paint brush I use to tidy the Buildtak. That seems to have fixed the problem. I'll report back if that's not the case. Now I'll be giving the sensors a quick swipe with the brush on a regular basis, just in case.