I've not installed anything new for a couple of weeks now. Yesterday was a weird one though, my Surface went back to doing that annoying thing of going to sleep every few minutes when it's not in use... of course the first thing I did was to double check the power settings, which are set to keep the Surface running for at least 30 minutes. Anyway, at the end of the night, I turned it off and for the first time it didn't show the above message. I put it back on again this morning to check and it seemed to be staying on. It really does have a mind of it's own sometimes!
I'll have to see what it decides to do tonight...