Never had that ( and donīt want to have it wink ).

Did you calibrate ( and from time to time ) CLEAN your screen ?

Do you use a protective film on your display ?

Dou you have some MIDI devices connected ( computer, pedal etc ) that could send program-changes ?

Do you have the EC5 or similar connected ?

Edited by Snoopy (08/18/16 02:48 AM)
Greetings from East-Frisia ( Northern-Germany )