I have an STR-DH810 home cinema amp on which the front LCD display keeps going blank - almost as though the display is 'switching off'.

Whever this happens, a gentle tap anywhere on the unit brings it back up again - sometimes it stays on for a few minutes, & sometimes for a few hours, but it always goes blank again eventually.

I've just been putting up with it as the issue doesn't affect the operation of the unit at all which contines to work perfectly normally.

Has anyone else experienced a similar problem.? I was wondering if anyone could shed some light on what might be causing the issue & whether or not it's fixable.? 

Many thanks in anticipation.