2001 Sable - radio

2001 Sable - Had to have keys made & additional fob - the dealer of course programmed everything and I paid his rent with the resultant charge - BUT: we left the dealership and a few miles down the road the radio came on - then went into CD mode- then back to the radio mode - turn it off and came back on a few minutes later. left it on once and after five minutes it shut off. It was OK before the key programming - is this going to go away as in everything getting messed when you change the battery or mess with the computer (takes some miles before the trans shifts right, etc? ) I'm ready to put my foot throught the radio!