For me 4.8 is far more stable than 4.7 and 4.6, I think Epic did a great job with 4.8 
It’s almost never crashing for me, only problem are all the bugs from 4.6 and 4.7 where some are fixed in 4.8, but 4.8 also introduced some new bugs. And with bugs I mean not fully working features, not crashes. Regarding crashes 4.8 is really really stable for me 
Could be because I almost never use undo and in the last weeks I have not used anim blueprints and I also don’t use vr preview.