Vauxhall Corsa Entertainment centre, radio etc?

Mine stopped last year and main dealers just put new fuse in which was in glove box, no. 3 I think it was. All was fine until this summer it just went again, again took to Main Dealers but it wasn't that fuse. Said it had to be booked in because they need to get the whole centre bit out and check. Left it for a few months, one day just thought to try again and hey presto, it worked .... only for two weeks and now back off again, very frustrating.