I've had 2 of these units do this, no particular issue with droppomg them or anything like that.
My first unit lasted 1 year and i was so pleased with it i got another(ecost.com) but this only lasted 1 week.

I have tried and tried but just cant recalibrate due to touchscreen issues after resetting the units.
(Have flashed firmware etc to no avail)

Has anyone any insight as to why these units obviously
have this built in defect and anyway at all to rectify ?????