MKV still has problems with the Popcorn Hour A200

Well I might have spoken too soon about MKV's. The other night I tried to play a couple of videos encoded as 720P in the MKV container. On a 100Mbs connection both stopped once and froze. After a minute or so and pressing stop on the remote, they would return to the splash screen and when Play was pressed, restart at the point of freezing. It must be a MKV problem since I have been able to watch ts files encoded as 720P for 2 hours with no freezing at all.