Problem with vauxhall vectra radio/electrics best way to fix? 03 saloon?

Hi anyone iv got a vauxhall vectra 03 had a problem with the radio locking and not being able to turn off up or down also couldn't change functions radio didn't turn off when I removed the ignition key to solve this problem I punched it and it switched off happend on drive home from work so twice now is it wiring or the radio or maybe wiring on the radio ?