OK what you can try is this (if you have not already done so):
Upgrade to latest BETA version firmware MENU > Setting > System > Upgrade > BETA version (blue button) > Select Version (there is currently only one version showing in BETA)
Once upgrade is complete then IMPORTANT part:
MENU > Setting > System > Reset > Clear MyTV data
Then test out in MyTV, test everything, Live, VOD, Series etc. and see how they get on - If it's still an issue (hopefully not) but if it is then come back to me but perhaps better by private message with some more details, I'll let you know what these are exactly if you just give me a shout over private message, some of them are going to be things that's probably best not posted in an open forum so better via private message but with any luck the above will be enough to get you going in any case, if not though we'll give it another try with something else! :)