Upon queueing in play mode on mobile, once an opponent is found the game exits back to the main menu. Then when trying to queue again, the game crashes and reconnects to the original game. This happens every time.
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Update: It appears that the problem stems from when the Hearthstone app is put on the background (originally I run Arcane Tracker and at the beginning of the match it starts recording so I guess that is the moment Hearthstone is in the background. The issue went away when I started the game without it). I actually noticed this when trying to type a whatsapp message while playing and was thrown back to the main menu.