@Chaos_SniperIn general, replays are not saved while the replay storage is down. As an alternative measure against such circumstances, you can go to your wc3 setting and enable autosave replay option or cut and rename the "LastReplay" file in your wc3 replay folder which is the replay of the last game you played on wc3.
There was a problem with the replay system associated to your particular game. Please try playing a twrpg game and let me know if the replay gets saved. The ones you played while we had the replay issue, will not be accessible or retrieved.