Oh man approximately when does it tend to crash by the way? Any specific actions that seem to cause it before it grows more unstable? Hard to isolate the issue without a crash log but I'll investigate what I can from the symptoms so I can possibly reproduce it on my end. Sorry you're having this issue...
I'm surprised it's able to run at all on 10.10.5 considering I used the OSX 10.11 SDK but I suppose it didn't use any huge and exclusive OSX features.