I am also having this problem with a Starling account. 4 random transactions missing from November. We have only been using Starling for a couple of months so I don't know if this is just a glitch, but from the other messages it seems probably not.

I have been onto QB support who just said "it happens sometimes" and Starling bank support who said that everything looks OK and they can't check individual transactions.

We just moved from Coop Bank which has much worse problems than this but disappointing that the bank feed from Starling -> QB is not reliable.