Facing the same issue in Big Sur 11.2.3.
panic(cpu 6 caller 0xffffff8020964a25): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds
service: com.apple.logd, total successful checkins since wake (4690 seconds ago): 470, last successful checkin: 0 seconds ago
service: com.apple.WindowServer, total successful checkins since wake (4690 seconds ago): 458, last successful checkin: 120 seconds ago
service: com.apple.remoted, total successful checkins since wake (4690 seconds ago): 470, last successful checkin: 0 seconds ago
ar0mal
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