I've got a fairly new printer build here - I'm running a smoothieboard 5X on the latest edge firmware.
This doesn't happen every time - so far 2/7 prints have run to completion.
It works fine for 25-30 minutes, and then halts with the error "Temperature took too long to be reached on B, HALT asserted, TURN POWER OFF IMMEDIATELY - reset or M999 required"
The problem is that there are no temperature issues - the heated bed sits within 0.5 degrees of the target after reaching temperature.
Any advice here would be appreciated - I'm rapidly running out of ideas.