Rhino.Compute crashes occasionally

Generally Rhino.Compute has installed well and been stable for us.
Occasionally it crashes with the following message.

I don’t really understand the details of the exception being reported… I think it is telling me that Kestrel timed-out because Compute did not return from an activity within the 100 seconds timeout period.
We have written a Rhino plugin that extracts the breps from a STEP file and usually this task doesn’t take more than a second or so.

So is this stack trace just indicating that our plugin code failed/crashed?

regards
Dan