Constant Crashes - every 2 or 3 minutes.. wtf??

Is anyone else getting this? I work in SL so I'm online/in-world pretty much all day, most days - usually everything runs fairly sweet aside from the regular borks and niggles.

I went away for a couple of days (PC wasn't left running) - now I've come back and literally every 2 or 3 minutes my client crashes out referencing memory that could not be read at 000xx999 or something. It tries to send an error report but that fails too.

I've tried updating the client from the secondlife.com website, I've tried the coolviewer mod, I'm about to try the onrez one but if that doesnt work I'm screwed, this PC has never had any problems, now I cant run SL without it crashing, basically.

Anyone got any ideas? Its driving me nuts!

and as weirdly as it started, the problem is gone. Nothing changed, it just went away. Odd.