Animation test/ stops at frame 28/

hi adam… i started the DR rendering yesterday (PT PT after talking) and now, a few hours ago, it showed me that message:
→ maybe the reason is, that one of 3 slaves stopped working cause of overheating, but i dont know…
after cancelling the merging process it went further…

Hi,
How much is the problem reproducible? Does it happen with every rendering, with every rendering involing failed nodes, or only this once?