I don't think so. I've check the router and nothing has changed. The correct ports are still open. It's just bricked itself overnight.
Has to be Virgin IMO but I can't bring myself to call tech support and go round in circles whilst they run me through the 101 point health check. "ok, so tun off your PC and tun it on again"...
EDIT: Yeah my NAS a static IP and I can still access from inside my network, just not from the internet. Google did take me to some VM threads but the I didn't find any answers so thought I'd ask the resident IT geeks here.