Lots of game crashes in the last 2-3 days

In the last 2-3 days the game crashed like 15-20 times and each time I saw this:



I've noticed that probability of crashing increased when I did these steps:
1) opened shared bank,
2) took one Dragon's Weapon Cache from it (Shift+LClick and drag, and type number 1, press Ok)
3) choose Barbarian (I have 33 Barbarians),
4) then double click on weapons to equip
5) drag and convert old weapons to ref points (type convert when needed)

The game often crashed on step 4), sometimes on step 5). It was quite often since it crashed after 3-4 toons doing steps 1)-5) or so.
Now all toons have equipped Antique weapons (and converted old weapons), but the game still crashing from time to time, even without opening bank at all. It doesn't crash very often though. For example, I did the whole Acquisitions Incorporated adventure (9 quests) and it didn't crash I think (maybe once, not sure). But now it crashed when I was just invoking, so no idea when it happens.