MacBook Pro 15" mid 2015 retina randomly freezing, trying to pinpoint the issue (not sleep related)
I know this is an old topic but I have been having the same issue and was finally able to find a solution after trying quite a few different things. For me, turning off Hardware Acceleration within my browser (Chrome) has completely eliminated the freezing. It had ramped up to happening almost every day, but since turning off Hardware Acceleration I haven't had a single crash in 2 weeks. 

I hope you have been able to resolve this problem for yourself already, and if not, I hope this trick works for you too!