Power cuts out and stops print

[asykesey 3]

Good-day wonderful folk,

This has happened once or twice returning the next day expecting to see a finished print, but finding that the machine has stopped mid print.

today was the first time i actually witnessed it happening, but it was only happening on the second layer (i had the heated bed at 25 degrees). but then it happened on a few hours in to a hugge print...

i swapped power supplies (we have three UM2+'s) and the same thing happened. Did another test and it seemed okay. however the 15 hour print on the one next to it then decided to die. same thing - click and power off then on.

occasionally the led's will flicker followed by a click and then the machine turns off then back on, but sometimes there was no flickering of the LED's.

this setup has worked all year with each machine plugged in and printing simultaneously happily (with one or two random failures in the past)

i'm at a loss here

[SyntaxTerror 342]

I'd start out inspecting the wire loom and connectors for possible shorts, just in case. The click would be the the main board power relay letting go.