Cash when i use 3-sessions

When I use one key for two windows, I always get an error after 1 minute.

Also explain: I used two separate 1 sessions before, and this has never happened. Today, after the administrator upgraded my key to 3 sessions, one of the games above two windows always crashed.

i use win10 64,,i9 9900k ,2080ti and 16GMemory ，In general, my CPU share of three game windows is 15% - 20%.i dont know why,please help me.thx