Sky Sports Golf problem

Several times now my SKY box (latest 2TB version) has suddenly dropped the end of a recording of golf, hence having ploughed through about four or more hours I suddenly find a message in mid transmission 'recording ended' or something similar. There are NO clashes, and it isn't after a hand-back to the studio to say CBS or the Golf Channel had dropped transmission. Still about 35% of disk space available, and I am not aware of it happening on any other recordings - albeit none are as long. Films e.g. are all OK.

Any thoughts folks?

Cheers