Hmmm. I've seen this before, but can't remember for the life of me what caused it... I know that doesn't help much.

At first I thought it was a timeout issue. If you're doing an Inc and it's looking for changed blocks, you can get a timeout if it doesn't find anything changed for a while. But looking at your times, that shouldn't be the case.

I'll keep trying to remember.. will let you know!

Did you look up ANS1017E and (RC-50) for TDP?