And on the 22nd day at the 13th hour your flint locked up and crashed 
right?
I will through my random 2 cents in with:
Been using 4.2.x snapshots sense December been pretty solid for my usage some have gone 7+ days without restart or issue (I consider that a good standard as good practice is to backup and restart equipment every 7-9 days)
Only time I have had a issue was if I kept settings, I normally load a config file saved and load any packages I want to try or need.
Good rule for Snapshot is Not to keep settings and start fresh then load a config file.