I have an A3000 with a WarpEngine CPU card.
I found that if the card is not secured to the posts,
over time the heating and cooling of the boards causes
contact with the slot to become spotty and have to re-seat
the card (not a fun job with the A3k).
So I secured the card to the posts and 'NO'problems since.
I would think your A4k would suffer from the same problem.
Mel
