Please read the entire thread before posting. This was suggested in the first sentence of the first reply.
Indeed it was, but it wasn't answered and so I thought it bore repeating as it's material in establishing if there's a bug or not - or is maybe caused by eg constant external edits (in some way) where folder monitoring is in place. Who knows, more information needed.
I apologise for transgressing on your copyright.
OP, hope you get it sorted. GL