I believe it is because you did not renew your contract, which I accidentally did one time in coach mode and each week went by and I literally just sat there doing nothing. Or maybe you ran out of money which I haven't really used owner mode so I dont know. You should be able to at least switch and then coach your same team...Or maybe you retired. Or maybe the game is busted which would also make sense. But there should be some way to get back to your same team, maybe switch to another team. then switch right back, i dont know. . .