Barcrest - Crystal Maze Help

[regal8ball]

Hi guys another bandit i need to get to scratch is the Crystal Maze badboy.. This the whats wrong, the machice works fine until switched off or money is taken out (not when paying out but when emptying machine). Then a there is a buzzing sound and you have to keep unplugging then plugging back in for the machine to work again. If kept on all the time theres no problem at all - only tried over a period of 7-8 hours...
I'm slowly trying be a genuis bandit god like you guys...many years in me yet haha