Some cards cause the game to instantly crash
I've notice that when some card are played or activated the game crashes, so far I've been able to rejoin without a problem but I've had games where I crash basically every turn.
The card in question so far are:
-Fight Rigging when the etb goes off
- Kaito Shizuki both +1 and -2 abilities
- Tamiyo Compleated Sage's +1 ability
- Jaya Fiery Negotiator's -1 ability
I would make sure that you are using the latest drivers for your video card since those cards have activated or triggered abilities with extensive graphical effects.
I would also make sure you have no other technical issues with your PC.