I've had several 'lock ups' on my last few flights (iFly 700 with 6.5.10, and a SkyRadar). 
In a couple of cases I've just noticed that things have stopped moving.  In another couple of cases I've pushed a button (e.g. Find  Airports) and the red button gets darker and simply stays that way.  Either way  further tapping buttons or dragging the screen does nothing. 
Anyone else having any such issues? Anyone have any ideas?