I have also now lost 3 conquest fights specifically to Merrin causing the game to freeze. 2 times to her first special, it is like she goes to stealth and the game freezes. This means I have to close the game, lose whatever plagues I had towards the region 2 counter and the conquest energy for the fight. So this time I tried not using that special, I went to use her 2nd one, and it Also froze......these 3 fights were not all on the same day either (and I restarted the client just before I started my conquest fights). I am using One UI version 6.1, Android version 14 on a Galaxy Tab S9.
(I just remembered I also lost 2 fights to freezes in tw, and I think 1-3 in the grand arena cycle, not with Merrin though, that is the only thing that has froze on me in conquest so far, no tb fight problems yet)