I have the same issue with a UE55MU7000 that's about a year old. The symptom was initially that recordings were just skipped without warning. Towards the end nothing scheduled ever got recorded. Then, finally, the "Too many reservations" dialogue box came up whenever trying to schedule a recording, despite the Scheduled list being empty. I had to save the channels to a USB drive, retune (Freesat), then restore the channels to get my favourites list back. It's a very obvious bug that Samsung should be able to fix easily. If they won't I'll have to request a replacement model that works properly.
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