Same kind of problem here.
Captured 720P 8bit @59.94 and was getting dropped frames on capture after about 3mins..
. Could not figure it out as before upgrade to FCS2 and BM6.2 I captured 10bit the same rez upto 12 min clips and was fine.
I even layed one clip ontop of another in the timeline with animated transparency and it played fine in 5.1.4 and BM6.1
Found out my raid even though I said just extended had in fact format “journaled”
so re-formatted raid to just OSX Extended, and thought that the end of it.
Nope… still won’t play back 2 streams from the raid but it did before :-/ Cant test re-capture as the deck was just on hire.. :-/
SO seems its not the raid… but fcp or bm.. wierd.
FCP did report playback was due to DISK SPEED in big red letters..