Using latest SS5 on iphone 7 plus, AZEQ6, SKIFI3 and Skywatcher HC.
When slewing in any direction manually via one of direction buttons, if the screen 'looses focus' i.e. from having finger at edge, switches application, the slew continues and does not stop and will slew 'forever'. it can be stopped when reconnects and you have to press button again and initiate another manual slew to stop
let me know if need any more and issue is clear