The issue with issues like this, is that we rarely can reproduce similar behaviour even if there is for sure situations where we have memory corruptions etc which would cause crashes that you have. Sometimes when it’s this re-occuring it can be everything from HW issues to some external program interfering (3d party record like fraps etc or anti-virus).
We have some upcomming fixes, it’s just hard to say if they fixes the issues you posted.
Regarding the network, it’s out of my expertise but I know they are working hard in fixing the issues repored there.