Problems streaming from ReadyNAS by SMB with MPC

Seems I'm revisiting this issue again, it's still skipping during playback, although the network usage seems realistic (It's possible I was misreading this before, reading for instance 0.30% as 30% as the scale autochanges with differing load) it's always under 1% which is about right I guess. It was working fine at one point, and all files seemed to stream ok, I'm not sure exactly what if anything has changed again since then, just shutdown/restarts.

I can't find any reference to this issue elsewhere and as far as I'm aware all the equipment should be more than capable of dealing with it all. The only possibility I can see is MPC is somehow putting the playback work onto the NAS but that doesn't seem right and if it did do this I'd expect it to be all over forums etc on google searches.

It's quite a frustrating issue as I have to transfer anything I want to play onto my PC first, and if it's a full series I then need to delete it/clear recycle bin each time, as I only run an SSD on my main PC now and it's getting full.