I was able to duplicate this after 60 hands on my tablet but I am not yet sure of the cause. The hands stopped importing on the cloud site's activity message page and stopped updating the HUD and Live Play tab as a result obviously.
I will have to discuss it with the other cloud testers and do more testing to see if I can duplicate it again as I forgot to enable detailed logging in my cloud client. Once we have more information we will take it to the developers.
I am wondering if it could be UAC related since that is still enabled on my tablet but I did make sure to run everything as admin via the right-click menu when launching the poker client, hm cloud, and hm2 after the session to import the hands manually to confirm hands count.