hello to everyone ,

I'm new member
by the way I have a little problem with my nav radio system on Chrysler grand voyager I think becker RB3

everythings work fine but when the nav radio use to be on for a long time (something like one hour) appear a little band on display on the right side .eveythings still continue to work no problem

I switch off the car and after few minutes when I turn on the car again , the band disappear and then appear again after few time

someone know what is the problem??

thanks in advance