The game is not running very stable on ps4 (pro)

I've got several crashes during yesterdays coop-session.

• Player1: Just throwing TNT; Player2: Dead
  • Outside
• Player1: Doing nothing; Player 2: Went to the shops in the village
• Player1: Just pressing X for fighting: Player2: Shooting Arrows
  • Inside the first dungeon are

Those three crashes I experienced just yesterday during the first mission of latest expansion (the one with the snow and ice), the second crash was at the shops, cant recall anymore wich shop.