My Macbook crashes every time with the same problem. At least it is predictable, when I unplug HDMI cable from my external monitor, my MacBook Pro (13-inch, 2017) with Big Sur macOS 11.1 (20C69) simply freezes with a panic report which I can only read after reboot: userspace watchdog timeout: no successful checkins from com.apple.WindowServer Here is the full report, Big Sur is like Windows 95 - there is no one out there for help panic(cpu 2 caller 0xffffff802236ea25): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds service: com.apple.logd, total successful checkins since wake (25381 seconds ago): 2539, last successful checkin: 0 seconds ago service: com.apple.WindowServer, total successful checkins since wake (25381 seconds ago): 2527, last successful checkin: 120 seconds ago Backtrace (CPU 2), Frame : Return Address 0xffffffb0cf85b670 : 0xffffff801f0b9aed 0xffffffb0cf85b6c0 : 0xffffff801f1fc6e3 0xffffffb0cf85b700 : 0xffffff801f1ecd1a 0xffffffb0cf85b750 : 0xffffff801f05ea2f 0xffffffb0cf85b770 : 0xffffff801f0b938d 0xffffffb0cf85b890 : 0xffffff801f0b9678 0xffffffb0cf85b900 : 0xffffff801f8be434 0xffffffb0cf85b970 : 0xffffff802236ea25 0xffffffb0cf85b980 : 0xffffff802236e678 0xffffffb0cf85b9a0 : 0xffffff801f84569e 0xffffffb0cf85b9f0 : 0xffffff802236dab4 0xffffffb0cf85bb20 : 0xffffff801f84f86b 0xffffffb0cf85bc80 : 0xffffff801f1a7d81 0xffffffb0cf85bd90 : 0xffffff801f0bf0e7 0xffffffb0cf85be00 : 0xffffff801f095905 0xffffffb0cf85be60 : 0xffffff801f0ad012 0xffffffb0cf85bef0 : 0xffffff801f1d0ec3 0xffffffb0cf85bfa0 : 0xffffff801f05f216 Kernel Extensions in backtrace: com.apple.driver.watchdog(1.0)[7AE04EA4-D026-39A0-B2D5-5C9E4EE72967]@0xffffff802236d000->0xffffff802236efff 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/RELEASEX8664 Kernel UUID: 82E2050C-5936-3D24-AD3B-EC4EC5C09E11 KernelCache slide: 0x000000001ee00000 KernelCache base: 0xffffff801f000000 Kernel slide: 0x000000001ee10000 Kernel text base: 0xffffff801f010000 _HIB text base: 0xffffff801ef00000 System model name: MacBookPro14,2 (Mac-CAD6701F7CEA0921) System shutdown begun: NO Panic diags file available: YES (0x0) Hibernation exit count: 34 System uptime in nanoseconds: 77717204288036 Last Sleep: absolute basetsc basenano Uptime : 0x000046aef25ac534 Sleep : 0x00002f9876430afa 0x00000001c1774955 0x00002f97589872c0 Wake : 0x00002f98980c7868 0x00000001c1aa631a 0x00002f9881301b66 last started kext at 77669072473364: >usb.!UUserHCI 1 (addr 0xffffff7fbf99d000, size 98304) last stopped kext at 77651505386089: >!UAudio 401.4 (addr 0xffffff7fbf50f000, size 307200) loaded kexts: usb.!UUserHCI 1 @macos.driver.!UEthernetHost 8.1.1 @filesystems.smbfs 3.4.1AudioAUUC 1.70 @filesystems.autofs 3.0!APlatformEnabler 2.7.0d0AGPM 119X86PlatformShim 1.0.0!AHIDALSService 1 @fileutil 20.036.15!AGraphicsDevicePolicy 6.2.2 @AGDCPluginDisplayMetrics 6.2.2!AUpstreamUserClient 3.6.8pmtelemetry 1!AHDA 283.15LuaHardwareAccess 1.0.16 |IOUserEthernet 1.0.1 |IO!BSerialManager 8.0.2f9!A!IKBLGraphics 16.0.1 @DontStealMacOS_X 7.0.0!AHV 1!ADiskImages2 1!A!IPCHPMC 2.0.1!ABacklight 180.3!AMCCSControl 1.14!AThunderboltIP 4.0.3eficheck 1!AEmbeddedOSSupportHost 1!A!IKBLGraphicsFramebuffer 16.0.1!A!ISlowAdaptiveClocking 4.0.0 @filesystems.apfs 1677.60.23 @filesystems.tmpfs 1 @filesystems.hfs.kext 556.60.1 @BootCache 40 @!AFSCompression.!AFSCompressionTypeZlib 1.0.0 @!AFSCompression.!AFSCompressionTypeDataless 1.0.0d1!ATopCaseHIDEventDriver 4020.6AirPort.BrcmNIC 1400.1.1 @private.KextAudit 1.0!ASmartBatteryManager 161.0.0!AACPIButtons 6.1!ARTC 2.0!ASMBIOS 2.1!AACPIEC 6.1!AAPIC 1.7 @!ASystemPolicy 2.0.0 @nke.applicationfirewall 310 |IOKitRegistryCompatibility 1 |EndpointSecurity 1 @kext.triggers 1.0!AGraphicsControl 6.2.2DspFuncLib 283.15 @kext.OSvKernDSPLib 529 |IOAVB!F 900.12 |IO!BHost!CUARTTransport 8.0.2f9 |IO!BHost!CTransport 8.0.2f9 @plugin.IOgPTPPlugin 900.11 |IOEthernetAVB!C 1.1.0!AHDA!C 283.15 |IOHDA!F 283.15 @!AGPUWrangler 6.2.2!ABacklightExpert 1.1.0!ASMBus!C 1.0.18d1 |IONDRVSupport 585 |IOAudio!F 300.6.1 @vecLib.kext 1.2.0X86PlatformPlugin 1.0.0IOPlatformPlugin!F 6.0.0d8!A!ILpssUARTv1 3.0.60!A!ILpssUARTCommon 3.0.60!AOnboardSerial 1.0 |IOSerial!F 11 |IOAccelerator!F2 439.52 @!AGraphicsDeviceControl 6.2.2 |IOGraphics!F 585 |IOSlowAdaptiveClocking!F 1.0.0usb.cdc.ncm 5.0.0usb.!UiBridge 1.0usb.cdc 5.0.0usb.networking 5.0.0usb.!UHostCompositeDevice 1.2usb.!UHub 1.2!AThunderboltDPInAdapter 8.1.4!AThunderboltDPAdapter!F 8.1.4!AThunderboltPCIDownAdapter 4.1.1!AHPM 3.4.4!A!ILpssI2C!C 3.0.60!ABSDKextStarter 3 |IOSurface 289.3 @filesystems.hfs.encodings.kext 1!AActuatorDriver 4400.28!AHIDKeyboard 222!AMultitouchDriver 4400.28!AInputDeviceSupport 4400.35!AHS!BDriver 4020.6IO!BHIDDriver 8.0.2f9!AHSSPIHIDDriver 61!AHSSPISupport 61!AThunderboltNHI 7.2.8 |IOThunderbolt!F 9.3.2 |IO80211!F 1200.12.2b1 |IOSkywalk!F 1mDNSOffloadUserClient 1.0.1b8corecapture 1.0.4!A!ILpssSpi!C 3.0.60!A!ILpssDmac 3.0.60 |IONVMe!F 2.1.0!A!ILpssI2C 3.0.60!A!ILpssGspi 3.0.60usb.!UXHCIPCI 1.2usb.!UXHCI 1.2 |IOUSB!F 900.4.2!AEFINVRAM 2.1!AEFIRuntime 2.1 |IOSMBus!F 1.1 |IOHID!F 2.0.0 $!AImage4 3.0.0 |IOTimeSync!F 900.11 |IONetworking!F 3.4DiskImages 493.0.0 |IO!B!F 8.0.2f9 |IOReport!F 47 |IO!BPacketLogger 8.0.2f9 $quarantine 4 $sandbox 300.0 @kext.!AMatch 1.0.0d1 |CoreAnalytics!F 1!ASSE 1.0!AKeyStore 2!UTDM 511.60.2 |IOUSBMass!SDriver 184.40.6 |IOSCSIBlockCommandsDevice 436.40.6 |IO!S!F 2.1 |IOSCSIArchitectureModel!F 436.40.6!AMobileFileIntegrity 1.0.5 @kext.CoreTrust 1!AFDEKeyStore 28.30!AEffaceable!S 1.0!ACredentialManager 1.0KernelRelayHost 1 |IOUSBHost!F 1.2!UHostMergeProperties 1.2usb.!UCommon 1.0!ABusPower!C 1.0!ASEPManager 1.0.1IOSlaveProcessor 1!AACPIPlatform 6.1!ASMC 3.1.9 |IOPCI!F 2.9 |IOACPI!F 1.4watchdog 1 @kec.pthread 1 @kec.corecrypto 11.1 @kec.Libm 1