I built a smart mirror using a Raspberry Pi 4 running MagicMirror software. The setup works great most of the time, but I've noticed that whenever the room lighting changes significantly - like when I turn on or off the overhead light - the Pi freezes and the mirror display stops updating. I initially thought it might be a power issue, so I switched to a higher-rated USB-C power supply (5V 3A), but the problem persists. I've also tried disabling the ambient light sensor module in the MagicMirror config, but that didn't help either. I'm running the latest Raspberry Pi OS and MagicMirror version. The Pi itself doesn't reboot; it just becomes unresponsive until I physically unplug and replug it. I'd love to keep the ambient light sensor active to adjust screen brightness automatically, but stability is more important. Has anyone encountered similar behavior with Raspberry Pi freezing due to environmental sensor inputs? Are there recommended logs or diagnostics I should check to pinpoint whether this is a software or hardware conflict? Any tips on stabilizing the Pi in a smart mirror setup with ambient lighting changes would be hugely appreciated!

That freeze when the lighting changes sounds like it could be related to how the ambient light sensor is handled at the OS or driver level, especially if disabling the module in MagicMirror didn’t help. Since the Pi itself doesn’t reboot, it might be worth digging into dmesg or /var/log/syslog right after a freeze to see if any kernel errors or I2C communication faults show up. Sometimes sensor glitches can cause the Pi’s I2C bus to hang, which might explain the freeze.

Also, consider testing the sensor hardware separately with a minimal script outside MagicMirror to see if the problem replicates. If it does, you might want to try a different sensor or add a hardware-level filter (like a capacitor) to smooth out sudden light changes. Others have mentioned power supply upgrades, but since you already tried that, it’s probably not the main culprit here.

Lastly,