JVC HiFi (Ifton Heath SY11)

I've loved this and it sounds great but it's developed an annoying problem with the on/off button where it intermittently goes through all the output modes instead of turning off or on until pressing it multiple times! Might be an easy fix for someone but I've got fed up of it now and bought a new one!
It has:
 DAB & FM Radio
CD & MP3 Player
USB Port
AUX
BLUETOOTH
CLOCK
SLEEP/DAILY TIMER
DIGITAL SOUND PROCESSOR

Collection only from St Martins please