InfoPath Dev

I created a rather complicated browser form (Infopath 2010) with a repeating table.  The form is consistently giving us the dreaded "you may have an infinite loop" error on open if 19 items in the table.  Yes, there are lots of default and calculated values, and quite a few Form Open rules.  I've read about the 16 actions limitation for InfoPath. 

The interesting thing is this -- a form with 11 items errors on open INTERMITTENTLY.  I can open it 7 times with no error, and on the 8th open I get the infinite loop error.  I think, also, that I'm more likely to get the error during business hours.  All of that seems to indicate that there is some kind of SharePoint threshold setting that might be too low for my form.  Any ideas? 

Thank you! 

 Can you see if you get the same error in InfoPath Filler instead of Browser? One thing I look out for in the Browser is rules or defaults on attributes - I've seen those make rules on their parent node or group fire.... which could cause something like this, but I don't know if it would be intermittent.