Game locking up and computer suddenly typing in foreign

I installed this to run my dcs simulator. Spent days making a great panel to find that when I try to use it the button presses are very hit and miss, then it locks my view in game and suddenly my computer only types in some foreign language until I restart the pc. Not the experience I was after.

I am using a samsung tab 4 10.1 as the interface.

Any idea why this doesnt work?