Navi Display discolors

Have a problem that I have not found here yet. My Navi has always worked 1A (even though I have rarely used it). Now the whole Navi display turns into a funny pink tone for “longer” operation (about 30 min), so it gets such a “stick”. It’s pretty clear to see. Otherwise everything works quite normal. If I turn it off and on again everything is fine again…. A few minutes later the same Schausp again iel.. So if it was the display the error would have to occur permanently, or ?! software ?? Have not updated it yet… Has anyone already experienced similar ?? Would have liked to have an opinion before I open up with Volvo, something is told to me and the whole thing only suddenly becomes super expensive…