It could be something to do with the blue police box I've seen hanging around recently ...
Set my time from auto to manual, corrected the time and switched back to auto, and it's been ok for the last hour *fingers crossed*
But just in case, apps that have updated or been installed over the last few days for me are:
Lookout mobile security, BBC news, MyBookDroid, BITS widget, Paradise Island and Kongregate.
edit: and back to fast again