I did some network related changes on Minibits server, you might retest if it helped. To get the proper result, please test with Minibits as the only mint (to avoid that the freeze remains due to similar issue on another mint server).
Discussion
Update. The freeze was a very extended delay. Had to open and leave open until it unfroze and allowed me to update. It did used to be pretty quick but lately has been slow to operate. I'll see if the new updates help
Thank you. Freezes were very likely caused by hanged requests to minibits server. Hopefully will be gone after the changes I did on server side (no need for app update due to this so far)