Could you please try a force refresh on your browser (instructions for each browser here: https://en.wikipedia.org/wiki/Wikipedia:Bypass_your_cache) and let me know if it helps or if it is still happening?
Two solutions to freezing: 1. Be confident or trick yourself into believing that you are truly great at games; 2. Save time on easy games - spend 3-4 min on game 1 and 5-6 min on game 2. If you have 12 minutes for a game, you can brute force through it...
@JHAldy10 The issue should be fixed now! If you are still seeing 504 errors please try force refresh and clearing your browser cache. If that doesn't help, please let us know.