There is a critical bug in MTG: Arena gameplay. Every time I try to start a duel, even with bot opponent, this duel ends automaticaly nearly 20 seconds later, and I get to my account screen. There are next steps to reproduce my case:
1. Enter MTG: Arena client with login and password
2. Choose a duel, for example, color challenge or spark ranking
3. Choose a match
4. Click Play button
5. Accept that you got an opponent to play
6. Wait for duel start
7. Make your turn or simply wait for some time
8. Duel ends and account opens again