I have the same issue, though I have a feeling it is from how old my Macbook is at this point (Bought in early 2016). It started crashing today and crashed about 8 times in the span of a few hours. At first I thought it was an issue with the game (been playing Minecraft) but I changed so many things to optimise it and nothing changed. I keep only the game open and no other app, lowest graphic settings, keeping my Macbook cool, restarting the world here and there, ... . But whatever I did it continues crashing and giving me this: panic(cpu 2 caller 0xffffff801b97999f): userspace watchdog timeout: no successful checkins from WindowServer in 120 seconds service: logd, total successful checkins since load (2260 seconds ago): 227, last successful checkin: 0 seconds ago service: WindowServer, total successful checkins since load (2230 seconds ago): 211, last successful checkin: 120 seconds ago service: opendirectoryd, total successful checkins since load (2260 seconds ago): 226, last successful checkin: 0 seconds ago