yes to bothm the double tap feature was off to start with when i was getting the issues, i turned it only only because i found it useful. i diont find the issues any different with it on or off.
also yes i do restart the tablet regularly, its not a constant issue it only seems to be if i allow the screen to time out.
anyway a new tablet has arrived today, i wont get to use it until later on though.hopefully it will be better.
Samsung Galaxy S4 I9505
Sony Xperia Z2 Tablet