Hi dflat,
It happens to me too. In iReal for mac.
I think it happens around 10% of the times... It starts an then it stops... sometimes during count, and sometimes in the second or third measure.
I think it happens since the last 2 updates.
I haven't reported it because I thought it was a known bug and it doesn't bother me too much because I use iReal only for private practice, but I can imagine that it can be VERY annoying for someone who use it for performing.
Thanks
Cronban