Top causes for a debugging session to suddenly disconnect? (RubyMine 5.4.1)

Hi everyone,

What are some causes I can look into regarding a debugging session suddenly disconnecting when hitting a breakpoint, then pressing F10 (or equivalent) to continue?  This happens to me quite a bit, and it's not always reproducible.  I'm using RM 5.4.1 and am on Ruby 1.9.3.

I can find no discernable pattern as to when it will happen, but it always happens after I'm stopped at a breakpoint and either try to continue (green arrow) or step over, or into the next line.

I'm sure it's tricky to diagnose the problem sometimes-- are there any 'clean slate' workarounds I can do in the meantime, to mimimize the number of times this happens?

Thanks,

-Larry