DP8K Core temperature reading 67000

I have a problem whit one of our DP8K’s
DP8K runs V1.2.1
When we use it on lager shows it cresses.
I’ve tested the same show file on a other DP8K and this DP8K runs the show whiteout any problem.
When the DP8K stops working it shows many temperature reading’s
Like this:
Core 1 temperature reading 67000
Core 2 temperature reading 63000
I/O Board Disconnected.

I’ve checked the cooling fans, they seem to work just fine, and start to cool when the DP8K is getting hot.
Anyone familiar to this problem?