I have that issue too. I am loosing whole screen no cursor just block white or grey or flashy screen. Force restart from power button than get these watchdog crash reports when boots. panic(cpu 12 caller 0xffffff801436ea25): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds service: com.apple.logd, total successful checkins since load (1690 seconds ago): 170, last successful checkin: 0 seconds ago service: com.apple.WindowServer, total successful checkins since load (1660 seconds ago): 153, last successful checkin: 120 seconds ago Backtrace (CPU 12), Frame : Return Address 0xffffffa13941b670 : 0xffffff80110b9aed mach_kernel : _handle_debugger_trap + 0x3dd 0xffffffa13941b6c0 : 0xffffff80111fc6e3 mach_kernel : _kdp_i386_trap + 0x143 0xffffffa13941b700 : 0xffffff80111ecd1a mach_kernel : _kernel_trap + 0x55a 0xffffffa13941b750 : 0xffffff801105ea2f mach_kernel : _return_from_trap + 0xff 0xffffffa13941b770 : 0xffffff80110b938d mach_kernel : _DebuggerTrapWithState + 0xad 0xffffffa13941b890 : 0xffffff80110b9678 mach_kernel : _panic_trap_to_debugger + 0x268 0xffffffa13941b900 : 0xffffff80118be434 mach_kernel : _panic_with_thread_context 0xffffffa13941b970 : 0xffffff801436ea25 com.apple.driver.watchdog : __ZN10IOWatchdog14userspacePanicEP8OSObjectPvP25IOExternalMethodArguments.cold.1 + 0x27 0xffffffa13941b980 : 0xffffff801436e678 com.apple.driver.watchdog : __ZN10IOWatchdog35userspaceDisableUserspaceMonitoringEP8OSObjectPvP25IOExternalMethodArguments 0xffffffa13941b9a0 : 0xffffff801184569e mach_kernel : __ZN12IOUserClient14externalMethodEjP25IOExternalMethodArgumentsP24IOExternalMethodDispatchP8OSObjectPv + 0x1de 0xffffffa13941b9f0 : 0xffffff801436dab4 com.apple.driver.watchdog : __ZN20IOWatchdogUserClient14externalMethodEjP25IOExternalMethodArgumentsP24IOExternalMethodDispatchP8OSObjectPv + 0x7c 0xffffffa13941bb20 : 0xffffff801184f86b mach_kernel : _is_io_connect_method + 0x35b 0xffffffa13941bc80 : 0xffffff80111a7d81 mach_kernel : _iokit_server_routine + 0x4d81 0xffffffa13941bd90 : 0xffffff80110bf0e7 mach_kernel : _ipc_kobject_server + 0x337 0xffffffa13941be00 : 0xffffff8011095905 mach_kernel : _ipc_kmsg_send + 0x115 0xffffffa13941be60 : 0xffffff80110ad012 mach_kernel : _mach_msg_overwrite_trap + 0x2d2 0xffffffa13941bef0 : 0xffffff80111d0ec3 mach_kernel : _mach_call_munger64 + 0x273 0xffffffa13941bfa0 : 0xffffff801105f216 mach_kernel : _hndl_mach_scall64 + 0x16 			Kernel Extensions in backtrace: 				 com.apple.driver.watchdog(1.0)[7AE04EA4-D026-39A0-B2D5-5C9E4EE72967]@0xffffff801436d000->0xffffff801436efff Process name corresponding to current thread: watchdogd Mac OS version: 20C69 Kernel version: Darwin Kernel Version 20.2.0: Wed Dec	2 20:39:59 PST 2020; root:xnu-7195.60.75~1/RELEASE_X86_64 Kernel UUID: 82E2050C-5936-3D24-AD3B-EC4EC5C09E11 KernelCache slide: 0x0000000010e00000 KernelCache base:	0xffffff8011000000 Kernel slide:			0x0000000010e10000 Kernel text base:	0xffffff8011010000 __HIB	text base: 0xffffff8010f00000 System model name: iMac19,1 (Mac-AA95B1DDAB278B95) System shutdown begun: NO Panic diags file available: YES (0x0) Hibernation exit count: 0 System uptime in nanoseconds: 1715294184881 Last Sleep:					 absolute					 base_tsc					base_nano 	Uptime	: 0x0000018f5f802a27 	Sleep	 : 0x0000000000000000 0x0000000000000000 0x0000000000000000 	Wake		: 0x0000000000000000 0x0000000e3e075f52 0x0000000000000000 service: com.apple.logd, total successful checkins since load (4510 seconds ago): 452, last successful checkin: 0 seconds ago service: com.apple.WindowServer, total successful checkins since load (4480 seconds ago): 436, last successful checkin: 120 seconds ago Backtrace (CPU 6), Frame : Return Address 0xffffffc1aaa83670 : 0xffffff800a6b9aed mach_kernel : _handle_debugger_trap + 0x3dd 0xffffffc1aaa836c0 : 0xffffff800a7fc6e3 mach_kernel : _kdp_i386_trap + 0x143 0xffffffc1aaa83700 : 0xffffff800a7ecd1a mach_kernel : _kernel_trap + 0x55a 0xffffffc1aaa83750 : 0xffffff800a65ea2f mach_kernel : _return_from_trap + 0xff 0xffffffc1aaa83770 : 0xffffff800a6b938d mach_kernel : _DebuggerTrapWithState + 0xad 0xffffffc1aaa83890 : 0xffffff800a6b9678 mach_kernel : _panic_trap_to_debugger + 0x268 0xffffffc1aaa83900 : 0xffffff800aebe434 mach_kernel : _panic_with_thread_context 0xffffffc1aaa83970 : 0xffffff800d96da25 com.apple.driver.watchdog : __ZN10IOWatchdog14userspacePanicEP8OSObjectPvP25IOExternalMethodArguments.cold.1 + 0x27 0xffffffc1aaa83980 : 0xffffff800d96d678 com.apple.driver.watchdog : __ZN10IOWatchdog35userspaceDisableUserspaceMonitoringEP8OSObjectPvP25IOExternalMethodArguments 0xffffffc1aaa839a0 : 0xffffff800ae4569e mach_kernel : __ZN12IOUserClient14externalMethodEjP25IOExternalMethodArgumentsP24IOExternalMethodDispatchP8OSObjectPv + 0x1de 0xffffffc1aaa839f0 : 0xffffff800d96cab4 com.apple.driver.watchdog : __ZN20IOWatchdogUserClient14externalMethodEjP25IOExternalMethodArgumentsP24IOExternalMethodDispatchP8OSObjectPv + 0x7c 0xffffffc1aaa83b20 : 0xffffff800ae4f86b mach_kernel : _is_io_connect_method + 0x35b 0xffffffc1aaa83c80 : 0xffffff800a7a7d81 mach_kernel : _iokit_server_routine + 0x4d81 0xffffffc1aaa83d90 : 0xffffff800a6bf0e7 mach_kernel : _ipc_kobject_server + 0x337 0xffffffc1aaa83e00 : 0xffffff800a695905 mach_kernel : _ipc_kmsg_send + 0x115 0xffffffc1aaa83e60 : 0xffffff800a6ad012 mach_kernel : _mach_msg_overwrite_trap + 0x2d2 0xffffffc1aaa83ef0 : 0xffffff800a7d0ec3 mach_kernel : _mach_call_munger64 + 0x273 0xffffffc1aaa83fa0 : 0xffffff800a65f216 mach_kernel : _hndl_mach_scall64 + 0x16 			Kernel Extensions in backtrace: 				 com.apple.driver.watchdog(1.0)[C1A64FD7-AD16-37E0-8FA1-A78A8E91D9FF]@0xffffff800d96c000->0xffffff800d96dfff Process name corresponding to current thread: watchdogd Mac OS version: 20C5061b Kernel version: Darwin Kernel Version 20.2.0: Mon Nov 23 05:24:51 PST 2020; root:xnu-7195.60.74~7/RELEASE_X86_64 Kernel UUID: 1DCC1F01-821E-36A7-BAED-6B8548ECD80E KernelCache slide: 0x000000000a400000 KernelCache base:	0xffffff800a600000 Kernel slide:			0x000000000a410000 Kernel text base:	0xffffff800a610000 __HIB	text base: 0xffffff800a500000 System model name: iMac19,1 (Mac-AA95B1DDAB278B95) System shutdown begun: NO Panic diags file available: YES (0x0) Hibernation exit count: 0 System uptime in nanoseconds: 4528658183420 Last Sleep:					 absolute					 base_tsc					base_nano 	Uptime	: 0x0000041e690ff91d 	Sleep	 : 0x0000000000000000 0x0000000000000000 0x0000000000000000 	Wake		: 0x0000000000000000 0x0000000b389bb8ee 0x0000000000000000