Hey there!
We just released an unversioned patch note fixing some of the issues you've been reporting during our holidays :)
Changelist
• Elite enemies in Haven-City are now properly scaling (some of them did not receive proper level scaling)
• We corrected the main source of crash (coming from projectiles and the fragmentation perk), some are still present though (but those we fixed were at the origin of 80% of the crashes you've been reporting)
• The perk "Chain Lightning" now properly scales at level 3