Game stuck repairing

The game needs repaired after I've quit and turned off my PC, every time. The repairs take anywhere from half an hour to eighteen hours, mostly because it seems to just be redownloading the entire game again. A couple of times it's got to the end of a repair, hits 99% then restarts the whole process again, without any prompting. I left the PC on one day, just repairing, it restarted five times before I couldn't take it anymore. Until randomly, eight days later, it worked and finally repaired. I played the game, enjoyed it to. saved, exited, turned back on, to make sure it was working, and finally turned off the PC for the night. next day, PC on, game needs repaired. Anyone else having issues like this? Or any ideas on the cause and/or fix? Thanks