VictorFS

Do yourself a favor and just switch to the external RTC. The battery simply doesn't last when trying to keep the Teensy's RTC running for months, it's really only suitable for protecting against short power blackouts.

Splashes near the on/off pin would be unlikely to happen, since that among the 5 pins below the SD card slot, we only use/solder the VBAT pin, which is as far away as possible from the On/Off pin. I also think it unlikely that this is the cause...

I'm also considering some issues regarding the Teensy LDO regulator NCV8186AMN330TAG, which is present on all my current Teensy 4.1 that failed somehow. In addition to the issue described on this thread (regarding VBAT preventing boot), which...

@sicco I agree that the possibility of water entering the equipment's enclosure, as you describe, is valid and can indeed happen. However, in the cases we've had, the equipment was opened for verification and the inside was completely clean and...

@sicco You're absolutely right about the environment and climates where those systems operate. However, the Teensy and all other electronics are placed inside a IP66 enclosure, so no water or insects can contact the electronics. Regarding...

Hi @defragster, thanks for your input. It seems weird to me that the floating On/Off pin would have been triggered, specially when its so uncommon with our Teensies. In any case, considering that I don't need the functionality of the On/Off...

We are facing the same issue (or very similar) with some of our Teensy 4.1 boards. Just for a quick context, we have hundreds of Teensy 4.1-based dataloggers/signal acquisition systems with custom PCBs. These dataloggers operate continuously...