While fighting in the arena, approx 2nd round, the battle froze. Characters were still swaying/moving, but personal timer on each character was not changing, no options were appearing, opposition wasn't attacking either...  everyone just stood & stared at each other.... 

I was using samsung J5 pro on wifi, 3feet from router.... so not a connection issue. 

Waited for few minutes to allow Raid opportunity to right itself.... then took a screenshot. Waited 20 or so seconds then took another, so u can see nothing changed except fight clock

5mins later it still had not rectified itself