I know where you coming from but I personally have always used Norton and have never had a single problem. Always ensured that I subscribed to the updates and never ran any other anti-virus programs on the same machine.
Shame there is no obvious way of recording any problems like this with some snap shot feature.
I notice this glitch has been reported before and is now being used to promote the SB stuff. P12 of the Radio-user magazine and I quote from it ‘100% compatible with AVG, Norton etc and will not be asked to disable your antivirus software another line states ‘………leave it running collecting data 24/7 with ZERO crashes. Which I personally think is a bit naughty.
The airband column ‘SBS files’ in the same mag is also possibly a little misleading and unfair on the RB.
Going back to the original problem. I have noticed that I had had some power saving features switch on, namely the option to put the hard drive and monitor into sleep mode after a period of inactivity.