Has anyone else got this before? It happened to me this afternoon and it has really pissed me off as it has taken me bloody ages to get to season 2017/8 and I was flying with Watford.
ALWAYS create back ups and keep them updated every now and then.
In your preferences, you can put Rolling Save on I believe it is called and i should automatically do it for you every time it automatically saves.
But always make your own backups and alternate between save files whenever you close your game down.