I also play Vella but I didn't encounter any freezes or crashes.
Like I said only problem is boss loot for me. Boss drops the loot and when I click "E" to get it it says "Item is unavailable, please try again later" and the loot disappears. Actually it isn't a really big problem because required items for story missions are given after you complete the dungeon, they aren't boss loots but it will prevent you from completing side quests that require boss loots.