I have a combination Beocenter 9500 and two Beolab Penta's.

Since a couples of weeks, the display of my left Beolab Penta changes from readable text (source, AUX, Volume, 22.....) to signes that look like Japanese and back to english. This happens several times per evening.

When I for example change the volume, the sign underneath the volume indication also changes.

Is there a memory that contains Japanese or other eastern language signs, and is there a way to change to normal english?