Danke für deine Antwort.
RAM ist getestet, Grafiktreiber war auch meine erste Idee.
Aber was kann man gegen abschmierenden Grafiktreiber machen?
Hier mal ein Teil-Log vom 17.12
{"caused_by":"macos","macos_version":"Mac OS X 10.15.7 (19H114)","os_version":"Bridge OS 5.1 (18P3030)","macos_system_state":"running","incident_id":"17D1940A-EEA6-4743-BD41-FFE613FCE33A","timestamp":"2020-12-17 10:35:58.00 +0000","bug_type":"210"}
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"build" : "Bridge OS 5.1 (18P3030)",
"crashReporterKey" : "c0dec0dec0dec0dec0dec0dec0dec0dec0de0001",
"date" : "2020-12-17 10:35:58.86 +0000",
"incident" : "17D1940A-EEA6-4743-BD41-FFE613FCE33A",
"kernel" : "Darwin Kernel Version 20.2.0: Fri Nov 13 19:36:30 PST 2020; root:xnu-7195.60.74~2\/RELEASE_ARM64_T8010",
"macOSOtherString" : "\n** In Memory Panic Stackshot Succeeded ** Bytes Traced 1020336 **\n",
"macOSPanicFlags" : "0x4",
"macOSPanicString" : "panic(cpu 2 caller 0xffffff7f979a1ad5): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds\nservice: com.apple.logd, total successful checkins since wake (7430 seconds ago): 744, last successful checkin: 0 seconds ago\nservice: com.apple.WindowServer, total successful checkins since wake (7430 seconds ago): 732, last successful checkin: 120 seconds ago\n\nBacktrace (CPU 2), Frame : Return Address\n0xffffff8764103720 : 0xffffff8016f1961d \n0xffffff8764103770 : 0xffffff8017053ac5 \n0xffffff87641037b0 : 0xffffff801704564e \n0xffffff8764103800 : 0xffffff8016ebfa40 \n0xffffff8764103820 : 0xffffff8016f18ce7 \n0xffffff8764103920 : 0xffffff8016f190d7 \n0xffffff8764103970 : 0xffffff80176c0128 \n0xffffff87641039e0 : 0xffffff7f979a1ad5 \n0xffffff87641039f0 : 0xffffff7f979a17fa \n0xffffff8764103a10 : 0xffffff8017651fce \n0xffffff8764103a60 : 0xffffff7f979a0cfe \n0xffffff8764103b60 : 0xffffff801765b1f3 \n0xffffff8764103ca0 : 0xffffff80170025c2 \n0xffffff8764103db0 : 0xffffff8016f1f388 \n0xffffff8764103e10 : 0xffffff8016ef5d35 \n0xffffff8764103e70 : 0xffffff8016f0cae2 \n0xffffff8764103f00 : 0xffffff801702b045 \n0xffffff8764103fa0 : 0xffffff8016ec0226 \n Kernel Extensions in backtrace:\n com.apple.driver.watchdog(1.0)[D825E633-F1A8-38C1-92F8-5018AC27C705]@0xffffff7f979a0000->0xffffff7f979a8fff\n\nBSD process name corresponding to current thread: watchdogd\nBoot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev\n\nMac OS version:\n19H114\n\nKernel version:\nDarwin Kernel Version 19.6.0: Tue Nov 10 00:10:30 PST 2020; root:xnu-6153.141.10~1\/RELEASE_X86_64\nKernel UUID: A477D537-F87E-3978-8D7F-A84B7C02E62E\nKernel slide: 0x0000000016c00000\nKernel text base: 0xffffff8016e00000\n__HIB text base: 0xffffff8016d00000\nSystem model name: iMac20,1 (Mac-CFF7D910A743CAAF)\nSystem shutdown begun: