Circling back to provide the conclusion of the issue on this thread. It looks like the cause of the spontaneous resets is the brownout detector circuit. Disabling it (not through menuconfig, but through the registers) looks to resolve the issue.

Further discussion on this thread:

https://www.esp32 ...

FYI, circling back on this post.

It does appear that the cause of the reset from deep sleep is the brownout detector. The power supply lines look very clean on the scope, so not sure why the brownout detector is triggering, but disabling it does seem to fix the problem.

See details in this thread ...

I have a support case with Espressif and have sent them the schematics and source... They are debating internally whether they want me to send them a board that repros the issue.

It looks like that sample will just disable the brownout interrupt, but won't it still reset the system? My theory for ...

Following the suggestion on to solve my sleep/reset issues on this thread: https://github.com/espressif/esp-idf/issues/6179,
I turned off the brownout detector. It did seem to solve the problem of spontaneous resets during deep sleep, but I found a new problem.

This code below is an almost ...

Wow, great find!! Well that certainly made a difference! Yes, I think it's the same issue. I have the same concern as the person at the bottom of that thread, why is it signaling POWERON instead of brownout?

Now it seems to have a new weird behavior... The same code that was sleeping fine and ...

Sure, no problem. Thanks for taking a look! :)

I've attached screen shots of both the power supply section and also the connections to the ESP32S2-WROOM module.
The correlation that I have noticed is that the lower the power gets, the more frequently it seems to hit this reset. When I have it ...

<Cross posted to Hardware, but a different angle here... This post is more about the code, less about the Hardware. :)>

I have a problem that is stumping me... I have an ESP32S2 board which uses the ESP32S2 WROOM module.

After I put the ESP32S2 into deep sleep, on MOST boards (I've got one magic ...

I have a problem that is stumping me... I have an ESP32S2 board which uses the ESP32S2 WROOM module.

After I put the ESP32S2 into deep sleep, on MOST boards (I've got one magic one that doesn't repro), after a while, the CPU will randomly reset. I've double checked the esp_reset_reason(), and it ...

Thanks @boarchuz! Your suggestions really helped! I got the simple example working pretty well and decided to go back to my full app (much bigger).

I feel like I'm getting a lot closer, but I am still getting spurious exceptions when my code isn't running. I have a bunch of logging in my code and I ...

I'm having some trouble debugging problems with my ULP_RISCV program. I've got some memory based logging set up, so I can see things back in the host when the host is running, but I keep getting ULP_RISCV crashes, (Wake up code ESP_SLEEP_WAKEUP_COCPU_TRAP_TRIG), and can't figure out how to debug ...