W211 comand issue

[foxy1305]

On my 58 plate e320 the comand system has slowed down when changing folders and tracks on music register and sd card reader. Either by button pressing or by voice if I ask for a track change, the new track appears on the screen but it can be quite a few seconds until the actual track changes. Hoping its juts a reboot or something? The car is booked in tomorrow for its annual service so could do with it being looked at by the dealer but just wanted to know what anyone thought the issue was
Thanks