Try Team Red Miner, this miner is one of the best for AMD video cards and it has a version for windows
https://bitcointalk.org/index.php?topic=5059817
This miner has a reduced commission for video cards with a Polaris chip.
What AMD drivers are you using?
What is the size of the virtual memory file? You need to install at least 16 GB.

I see you have 2 cards.  I would start up 2 different instances, each mining with 1 card, and see if it still happens.  If one of them hangs, and the other doesn't that doesn't tell us the problem, but at least narrows it down