This happens more or less every 2nd day early in the morning when I try to start, the system was rebooted. Any idea how to fix this ? iMac Modellname: iMac  Modell-Identifizierung: iMac15,1  Prozessortyp: Quad-Core Intel Core i5  Prozessorgeschwindigkeit: 3.5 GHz  Anzahl der Prozessoren: 1  Gesamtanzahl der Kerne: 4  L2-Cache (pro Kern): 256 KB  L3-Cache: 6 MB  Speicher: 32 GB  Systemfirmwareversion: 431.140.6.0.0  SMC-Version (System): 2.22f16  **panic(cpu** 1 caller 0xffffff80227fea25): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds service: com.apple.logd, total successful checkins since wake (1430 seconds ago): 144, last successful checkin: 0 seconds ago service: com.apple.WindowServer, total successful checkins since wake (1430 seconds ago): 132, last successful checkin: 120 seconds ago Backtrace (CPU 1), Frame : Return Address 0xffffffa0bce43670 : 0xffffff801f48cfdd 0xffffffa0bce436c0 : 0xffffff801f5d3fd3 0xffffffa0bce43700 : 0xffffff801f5c45ca 0xffffffa0bce43750 : 0xffffff801f431a2f 0xffffffa0bce43770 : 0xffffff801f48c7fd 0xffffffa0bce43890 : 0xffffff801f48caf3 0xffffffa0bce43900 : 0xffffff801fc9ce34 0xffffffa0bce43970 : 0xffffff80227fea25 0xffffffa0bce43980 : 0xffffff80227fe660 0xffffffa0bce439a0 : 0xffffff801fc1d67e 0xffffffa0bce439f0 : 0xffffff80227fda34 0xffffffa0bce43b20 : 0xffffff801fc2792b 0xffffffa0bce43c80 : 0xffffff801f57f7d1 0xffffffa0bce43d90 : 0xffffff801f49265d 0xffffffa0bce43e00 : 0xffffff801f468cd5 0xffffffa0bce43e60 : 0xffffff801f4801e2 0xffffffa0bce43ef0 : 0xffffff801f5a869d 0xffffffa0bce43fa0 : 0xffffff801f432216 Kernel Extensions in backtrace: com.apple.driver.watchdog(1.0)[4CFADD2A-613E-320D-AD14-9C9379E87CB7]@0xffffff80227fc000->0xffffff80227fefff Process name corresponding to current thread: watchdogd Mac OS version: 20G165 Kernel version: Darwin Kernel Version 20.6.0: Mon Aug 30 06:12:21 PDT 2021; root:xnu-7195.141.6~3/RELEASE_X86_64 Kernel UUID: C2591F4E-EE82-33CC-8C59-DB81D9AD80DD KernelCache slide: 0x000000001f200000 KernelCache base: 0xffffff801f400000 Kernel slide: 0x000000001f210000 Kernel text base: 0xffffff801f410000 __HIB text base: 0xffffff801f300000 System model name: iMac15,1 (Mac-42FD25EABCABB274) System shutdown begun: NO Panic diags file available: NO (0xe00002bc) Hibernation exit count: 0 System uptime in nanoseconds: 54871209471415 Last Sleep: absolute base_tsc base_nano Uptime : 0x000031e7b2f2f0c4 Sleep : 0x0000309891fa771f 0x00000000435d4b0d 0x00002e03047989b5 Wake : 0x000030989950595c 0x00000000433523b2 0x0000309898b759e9 last started kext at 50615930221912: @filesystems.smbfs 3.6.1 (addr 0xffffff7fbad40000, size 491520) last stopped kext at 271735750053: >!AFIVRDriver 4.1.0 (addr 0xffffff7fb8a51000, size 8192) loaded kexts: org.virtualbox.kext.VBoxNetAdp 6.1.18 org.virtualbox.kext.VBoxNetFlt 6.1.18 org.virtualbox.kext.VBoxUSB 6.1.18 org.virtualbox.kext.VBoxDrv 6.1.18 com.paragon-software.filesystems.ntfs 108.8.15 com.disc-soft.DAEMONTools.VirtualSCSIBus 1.0.2 @filesystems.smbfs 3.6.1 @fileutil 20.036.15ATfilesystems.autofs 3.0 !ATopCaseHIDEventDriver 4050.1 !A!BMultitouch 99 AudioAUUC 1.70 AGPM 122.1 !APlatformEnabler 2.7.0d0 X86PlatformShim 1.0.0 !AMikeyHIDDriver 131 !AUpstreamUserClient 3.6.8 @kext.AMDFramebuffer 4.0.6 !AMikeyDriver 283.15ATkext.AMDRadeonX4000 4.0.6 @kext.AMDRadeonServiceManager 4.0.6 !AGraphicsDevicePolicy 6.3.5 @AGDCPluginDisplayMetrics 6.3.5pmtelemetry 1 |IOUserEthernet 1.0.1 !AHDA 283.15 usb.!UUserHCI 1 |IO!BSerialManager 8.0.5d7 @Dont_Steal_Mac_OS_X 7.0.0 !AHV 1 !ADiskImages2 1 !A!IHD5000Graphics 16.0.5 !AThunderboltIP 4.0.3 !AMCCSControl 1.14 !A!IFramebufferAzul 16.0.5 eficheck 1 !ALPC 3.1 !ASMCLMU 212 @kext.AMD7000!C 4.0.6 !A!ISlowAdaptiveClocking 4.0.0 |IO!BUSBDFU 8.0.5d7 |SCSITaskUserClient 436.140.1 !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 @filesystems.apfs 1677.141.2 AirPort.BrcmNIC 1400.1.1 !ASDXC 1.9.0ATprivate.KextAudit 1.0 |!ABCM5701Ethernet 11.0.0 !AAHCIPort 346.100.2 !ARTC 2.0 !AACPIButtons 6.1 !AHPET 1.8 !ASMBIOS 2.1 !AACPIEC 6.1 !AAPIC 1.7 @!ASystemPolicy 2.0.0 @nke.applicationfirewall 311 |IOKitRegistryCompatibility 1 |EndpointSecurity 1 |IOUSBUserClient 900.4.2Aplugin.IOAVBDiscoveryPlugin 940.4 @kext.triggers 1.0 !AHIDKeyboard 224 !AHS!BDriver 4050.1 IO!BHIDDriver 8.0.5d7 !AMultitouchDriver 4440.3 !AInputDeviceSupport 4400.35 @kext.AMDRadeonX4030HWLibs 1.0 @kext.AMDRadeonX4000HWServices 4.0.6 !AGraphicsControl 6.3.5 DspFuncLib 283.15 @kext.OSvKernDSPLib 529 |IOSerial!F 11 |IOAVB!F 940.4 |IOEthernetAVB!C 1.1.0 usb.IOUSBHostHIDDevice 1.2 !AThunderboltEDMSink 5.0.3 !ASMBus!C 1.0.18d1 |IOAccelerator!F2 442.9 |IONDRVSupport 585.1 X86PlatformPlugin 1.0.0 !AHDA!C 283.15|IOHDA!F 283.15 !ASMBusPCI 1.0.14d1 IOPlatformPlugin!F 6.0.0d8 !UAudio 405.39 |IOAudio!F 300.6.1 @vecLib.kext 1.2.0 @kext.AMDSupport 4.0.6 @!AGPUWrangler 6.3.5 @!AGraphicsDeviceControl 6.3.5 |IOGraphics!F 585.1 |IOSlowAdaptiveClocking!F 1.0.0 @plugin.IOgPTPPlugin 985.2 |Broadcom!BHost!CUSBTransport 8.0.5d7 |IO!BHost!CUSBTransport 8.0.5d7 |IO!BHost!CTransport 8.0.5d7 usb.cdc 5.0.0 usb.networking 5.0.0 usb.!UHostCompositeDevice 1.2 usb.!UHub 1.2 !AThunderboltDPOutAdapter 8.1.4 !AThunderboltDPInAdapter 8.1.4 !AThunderboltDPAdapter!F 8.1.4 !AThunderboltPCIDownAdapter 4.1.1 !ABSDKextStarter 3 |IOSurface 290.8.1 @filesystems.hfs.encodings.kext 1 !AXsanScheme 3 |IOAHCIBlock!S 332 !AThunderboltNHI 7.2.8 |IOThunderbolt!F 9.3.2 usb.!UHostPacketFilter 1.0 |IOUSB!F 900.4.2 |IO80211!F 1200.12.2b1 |IOSkywalk!F 1 corecapture 1.0.4 mDNSOffloadUserClient 1.0.1b8 usb.!UXHCIPCI 1.2 usb.!UXHCI 1.2 |IOAHCI!F 294.100.1 !A!ILpssGspi 3.0.60 !AEFINVRAM 2.1 !AEFIRuntime 2.1|IOSMBus!F 1.1 |IOHID!F 2.0.0 $!AImage4 3.0.0 |IOTimeSync!F 985.2 |IONetworking!F 3.4 DiskImages 493.0.0 |IO!B!F 8.0.5d7 |IOReport!F 47 |IO!BPacketLogger 8.0.5d7 $quarantine 4 $sandbox 300.0 @kext.!AMatch 1.0.0d1 |CoreAnalytics!F 1 !ASSE 1.0 !AKeyStore 2 !UTDM 511.141.1|IOUSBMass!SDriver 184.140.2 |IOSCSIBlockCommandsDevice 436.140.1 |IO!S!F 2.1 |IOSCSIArchitectureModel!F 436.140.1 !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 —T