I saw one other unresolved post on this from 2021 (Hardware issues? - Apple Community), but I have the same issue: from time to time random 'QR code' like squares flash on my screen for less than a second then are gone. Too quick to screen grab.
2020 MacBook Air running OS Monterey 12.2.1
MacBook Air 13″, macOS 10.14
It is difficult to troubleshoot seldom occurring or random events such as that, but determine if the same anomalies occur in "Safe Mode": How to use safe mode on your Mac - Apple Support.
If it occurs even once while using your Mac in that mode, the cause is likely to be hardware-related.
It is difficult to troubleshoot seldom occurring or random events such as that, but determine if the same anomalies occur in "Safe Mode": How to use safe mode on your Mac - Apple Support.
If it occurs even once while using your Mac in that mode, the cause is likely to be hardware-related.
Random 'QR codes' flashing on screen
