My R1+ recently started shutting off after a few minutes of use. In my uneducated opinion, it seems like getting the extruder up to operating temperature puts a strain on the machine and causes it to shut down. When the extruder starts to heat up, the LEDs start to flicker, and then it shuts off. After a short amount of time, it will turn back on by itself. I recently replaced the psu, hoping that would solve the problem. When I took the factory psu out, the #2 terminal was charred. I'm not sure if that's related. =================== Update - 22 April 2019 It's fixed! For a total of about $50, I've got a working printer again. Here's a list of everything I did to solve the problem: 1) Replace power supply. 2) Replace control board (keep stock arduino) with kit (control board + stepper drivers). Added bonus of a gaining the reprap full graphics screen. 3) Flash latest firmware onto arudino. 4) Re-wire LEDs and fans to the green plug on the control board.