Strange playback from network drive

[Reddwarf]

So I set up a network server and connected to it from my htpc, tried some recordings and recording to a network share seems to work fine. But playback behaves strange, it plays fine for about a minute, then pauses for a while and when playback resumes it plays fast forward for a while, then normal a bit and pause agin.

Has anyone else seen this behaviour? Any ideas why? The connection is wired gigabit network and the actual drive ia a 2Tb raid array on a Linux Mint host.