I also had this issue twice in 2 hours. MacBook Pro (13-inch, 2017, Two Thunderbolt 3 ports) Processor: 2.3 GHz Dual-Core Intel Core i5 Memory: 8 GB 2133 MHz LPDDR3 Graphics: Intel Iris Plus Graphics 640 1536 MB At the time, I haven't had any external peripheral connected. panic(cpu 0 caller 0xffffff80049eba25): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 158 seconds service: com.apple.logd, total successful checkins since load (8379 seconds ago): 833, last successful checkin: 22 seconds ago service: com.apple.WindowServer, total successful checkins since load (8349 seconds ago): 819, last successful checkin: 158 seconds ago Backtrace (CPU 0), Frame : Return Address 0xffffffb0b10b3670 : 0xffffff800168e02d  0xffffffb0b10b36c0 : 0xffffff80017d48e3  0xffffffb0b10b3700 : 0xffffff80017c4eda  0xffffffb0b10b3750 : 0xffffff8001632a2f  0xffffffb0b10b3770 : 0xffffff800168d84d  0xffffffb0b10b3890 : 0xffffff800168db43  0xffffffb0b10b3900 : 0xffffff8001e9d6f4  0xffffffb0b10b3970 : 0xffffff80049eba25  0xffffffb0b10b3980 : 0xffffff80049eb660  0xffffffb0b10b39a0 : 0xffffff8001e1eede  0xffffffb0b10b39f0 : 0xffffff80049eaa34  0xffffffb0b10b3b20 : 0xffffff8001e2911b  0xffffffb0b10b3c80 : 0xffffff8001780401  0xffffffb0b10b3d90 : 0xffffff80016936ad  0xffffffb0b10b3e00 : 0xffffff8001669c85  0xffffffb0b10b3e60 : 0xffffff80016812a2  0xffffffb0b10b3ef0 : 0xffffff80017a91fd  0xffffffb0b10b3fa0 : 0xffffff8001633216     Kernel Extensions in backtrace:      com.apple.driver.watchdog(1.0)[57B278ED-0B7C-3544-9CFE-53963BB1DAF3]@0xffffff80049e9000-0xffffff80049ebfff Process name corresponding to current thread: watchdogd Mac OS version: 20E241 Kernel version: Darwin Kernel Version 20.4.0: Thu Apr 22 21:46:47 PDT 2021; root:xnu-7195.101.2~1/RELEASE_X86_64 Kernel UUID: 068F99A3-1DB3-31C0-87D5-09942F122BB6 KernelCache slide: 0x0000000001400000 KernelCache base: 0xffffff8001600000 Kernel slide:   0x0000000001410000 Kernel text base: 0xffffff8001610000 __HIB text base: 0xffffff8001500000 System model name: MacBookPro14,1 (Mac-B4831CEBD52A0C4C) System shutdown begun: NO Panic diags file available: YES (0x0) Hibernation exit count: 0 System uptime in nanoseconds: 8408583483730 Last Sleep:      absolute      base_tsc     base_nano  Uptime : 0x000007a5c6a1b586  Sleep  : 0x0000000000000000 0x0000000000000000 0x0000000000000000  Wake  : 0x0000000000000000 0x0000000c02662fa4 0x0000000000000000 last started kext at 220969630009: com.box.filesystems.osxfuse 403.11.2 (addr 0xffffff7f9c85e000, size 86016) loaded kexts: com.box.filesystems.osxfuse 403.11.2 AudioAUUC 1.70 @filesystems.autofs 3.0 @fileutil 20.036.15 |IO!BSerialManager 8.0.4d18 !APlatformEnabler 2.7.0d0 AGPM 122 X86PlatformShim 1.0.0 !AGraphicsDevicePolicy 6.2.9 !AUpstreamUserClient 3.6.8 @AGDCPluginDisplayMetrics 6.2.9 pmtelemetry 1 |IOUserEthernet 1.0.1 !AHDAHardwareConfigDriver 283.15 usb.!UUserHCI 1 @Dont_Steal_Mac_OS_X 7.0.0 !AHDA 283.15 !A!IKBLGraphics 16.0.2 !AHV 1 AGDCBacklightControl 6.2.9 !A!IKBLGraphicsFramebuffer 16.0.2 ACPI_SMC_PlatformPlugin 1.0.0 !A!IPCHPMC 2.0.1 !AThunderboltIP 4.0.3 !ABacklight 180.3 !ADiskImages2 1 !A!ISlowAdaptiveClocking 4.0.0 !ACameraInterface 7.6.0 !ASMCLMU 212 !AGFXHDA 100.1.433 !AFIVRDriver 4.1.0 eficheck 1 !AMCCSControl 1.14 @filesystems.apfs 1677.100.114 !AFileSystemDriver 3.0.1 @filesystems.tmpfs 1 @filesystems.hfs.kext 556.100.11 @BootCache 40 @!AFSCompression.!AFSCompressionTypeZlib 1.0.0 @!AFSCompression.!AFSCompressionTypeDataless 1.0.0d1 !ATopCaseHIDEventDriver 4040.11 AirPort.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 311 |IOKitRegistryCompatibility 1 |EndpointSecurity 1 @kext.triggers 1.0 !AGraphicsControl 6.2.9 |IOAVB!F 940.4 |IOEthernetAVB!C 1.1.0 DspFuncLib 283.15 @kext.OSvKernDSPLib 529 |IOAccelerator!F2 442.9 @plugin.IOgPTPPlugin 980.4 IOPlatformPluginLegacy 1.0.0 !ABacklightExpert 1.1.0 |IO!BHost!CUARTTransport 8.0.4d18 |IO!BHost!CTransport 8.0.4d18 !AThunderboltEDMSink 5.0.3 !AThunderboltDPOutAdapter 8.1.4 @!AGPUWrangler 6.2.9 @!AGraphicsDeviceControl 6.2.9 |IOSlowAdaptiveClocking!F 1.0.0 !AHDA!C 283.15 |IOHDA!F 283.15 |IONDRVSupport 585.1 |IOAudio!F 300.6.1 @vecLib.kext 1.2.0 !A!ILpssUARTv1 3.0.60 !A!ILpssUARTCommon 3.0.60 !AOnboardSerial 1.0 |IOSerial!F 11 !ASMBusPCI 1.0.14d1 X86PlatformPlugin 1.0.0 IOPlatformPlugin!F 6.0.0d8 |IOGraphics!F 585.1 !ASMBus!C 1.0.18d1 !AThunderboltDPInAdapter 8.1.4 !AThunderboltDPAdapter!F 8.1.4 !AThunderboltPCIDownAdapter 4.1.1 !AHPM 3.4.4 !A!ILpssI2C!C 3.0.60 !AXsanScheme 3 !ABSDKextStarter 3 |IOSurface 290.7 @filesystems.hfs.encodings.kext 1 !AActuatorDriver 4440.3 !AHIDKeyboard 224 !AMultitouchDriver 4440.3 !AInputDeviceSupport 4400.35 !AHS!BDriver 4040.11 IO!BHIDDriver 8.0.4d18 !AHSSPIHIDDriver 61 !AHSSPISupport 61 !AThunderboltNHI 7.2.8 |IOThunderbolt!F 9.3.2 |IO80211!F 1200.12.2b1 |IOSkywalk!F 1 mDNSOffloadUserClient 1.0.1b8 corecapture 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 3.0.60 usb.!UXHCIPCI 1.2 usb.!UXHCI 1.2 usb.!UHostPacketFilter 1.0 |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 980.4 |IONetworking!F 3.4 DiskImages 493.0.0 |IO!B!F 8.0.4d18 |IOReport!F 47 |IO!BPacketLogger 8.0.4d18 $quarantine 4 $sandbox 300.0 @kext.!AMatch 1.0.0d1 |CoreAnalytics!F 1 !ASSE 1.0 !AKeyStore 2 !UTDM 511.101.1 |IOUSBMass!SDriver 184.101.1 |IOSCSIBlockCommandsDevice 436.100.4 |IO!S!F 2.1 |IOSCSIArchitectureModel!F 436.100.4 !AMobileFileIntegrity 1.0.5 @kext.CoreTrust 1 !AFDEKeyStore 28.30 !AEffaceable!S 1.0 !ACredentialManager 1.0 KernelRelayHost 1 |IOUSBHost!F 1.2 !UHostMergeProperties 1.2 usb.!UCommon 1.0 !ABusPower!C 1.0 !ASEPManager 1.0.1 IOSlaveProcessor 1 !AACPIPlatform 6.1 !ASMC 3.1.9 |IOPCI!F 2.9 |IOACPI!F 1.4 watchdog 1 @kec.pthread 1 @kec.corecrypto 11.1 @kec.Libm 1