Something similar happened to my Roamio Pro about a year ago. It suddenly would use all 6 tuners to record a european soccer game early on Sunday mornings. It appeared to always be the same team/league that was being targeted when it happened. I think it was bundeslige, but I don't recall for sure at this point. I did not normally watch the sports channel being used, so I deactivated the channel and the problem did not reoccur.