held notes and sync error

[thething]

hello!

got my virus a few weeks ago and been having a few problems. i actually bought it as a repaired model, b stock from digital village, so got it for £870. its a TI2 desktop, and it has fully up to date firmwire 3.0.5

I occasionally get a problem whereby the notes will hold for ever. so i will just get the last note played until i close down the virus vst. even if i do that, if i turn it back on the stuck note is still playing. this is cubase 5.0 i am running by the way.

It also comes up with 'sync error - please pause and restart' practically every 2 minutes on the vst, however i can't actually see what problem this causes. just be nice to clear this up really.

i only have a 3 month warranty as it was repaired stock so i'd rather sort it out now if it is something sinister!

pc is;


Intel Core i7 920 2.66Ghz D0 Overclocked to 3.40GHz!
Gigabyte EX58-UD3R Intel X58 (Socket 1366) PCI-Express DDR3 Motherboard
Corsair XMS3 6GB (3x2GB) DDR3 PC3-12800C9 (1600MHz) Tri-Channel


thanks in advance,
matt