The experiment has been running stably during the afternoon.
DAQ rates have remained constant and the frequency of hits in the Go4 has remained 1 hit every ~few mins.

However, leakage currents have increased significantly in most detectors, by up to a factor of 20x times in some.

I find it hard to see how radiation damage could cause this, but using the rule of thumb of 2x current for 8C rise in temperature, this would imply a >35C rise. This also doesn't seem realistic.

I don't currently have any other ideas.

Attached is the current leakage current plot - it is clear they have been increasing linearly since this afternoon.