Your Plugins list was not exhaustive.
“SUSOLID” is a known culprit - it has badly formed observers which clash with AutoSave…
Do you have it installed ?
Its author said over a week ago that he was fixing it, but nothing yet…
So either don’t have that Plugin load, or don’t enable AutoSave !
See here: http://forums.sketchup.com/t/sketchup-crashes-every-few-minutes/ …