http://bugs.winehq.org/show_bug.cgi?id=58649
--- Comment #1 from Rafał Mużyło galtgendo@o2.pl --- If there are crashes, were are the logs from them ?
If the window 'disappears', did you check with xwininfo (or whatever its equivalent for wayland is) if the window still exists, but was moved offscreen and/or unmapped ?