I had the exact same thing happen to me, i was playing on gamdom and had a max retrigger and wanted to use the snipping tool to take a screenshot of the screen. When i did this the game screen went black and i could not get back in the game round. Everytime i refresh the game it replayed the spin before it freeze and then the screen went black but with still game music playing etc, tried clearing cache and tried open game on my phone and was still same issue. I got the support to manually close the game round eventually though as i think they had to contact relax gaming to get it closed. (i got my funds like 1-2 hours later)