Have seen several complaints about such odd behaviors when all was well. They blame it on an update and I've seen the M$ notes acknowledging the issue and saying they are working on a fix. Unfortunately I cannot recall the specifics but you could probably research it and see if you think it applies if you get no solution after going the corruption route. The recommended fix was to roll back the update.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.