Every so often (every few weeks), especially when my machine (14" M3 Max) wakes up from sleep, things go a little haywire on my external monitor. Windows, screen elements, etc, disappear and (often, not always) are replaced with big blobs of magenta. This seems to persist until the machine is restarted, at which time everything seems to be resolved. It's not just a display issue, as I've done a screen capture when it happened, and the magenta is there. It also travels if I move a window between the main display and the laptop display.
When it hits, other things go wrong, too. terminal windows stop responding or scrolling. Keyboard shortcuts sometimes fail, etc. It seems like memory is generally corrupted in unpredictable ways. I haven't seen a kernel panic yet.
I've tried different cables between the laptop and the monitor, as well as different cable technologies (displayport, HDMI). Diagnostics doesn't find anything wrong, but that runs after a reboot, which usually fixes everything. This has been happening for months, and is getting frustrating.
When it hits, other things go wrong, too. terminal windows stop responding or scrolling. Keyboard shortcuts sometimes fail, etc. It seems like memory is generally corrupted in unpredictable ways. I haven't seen a kernel panic yet.
I've tried different cables between the laptop and the monitor, as well as different cable technologies (displayport, HDMI). Diagnostics doesn't find anything wrong, but that runs after a reboot, which usually fixes everything. This has been happening for months, and is getting frustrating.