I've had an OVMS module in my Ioniq 5 since I got it new in summer 2023. It worked fine until December 2025 (though I only noticed recently), when it stopped reporting.
Having looked at the issue, the device's own AP is still available but now rejects any passwords. The cellular connection is still active, but no data transfer. Most weirdly, if you power cycle the thing, it will run normally for several hours, transferring data over wifi (connected to the house AP) or cellular, and allowing for connections to its own AP with the correct password, before reverting into this state.
Tried an older firmware I know was good and the latest, both exhibited the same behaviour.
It does seem like the ESP32 has gone peculiar, but i wanted to ask if anyone else has experienced this? Is there a fix, or is it going to be easier for me to just open it and swap in a new ESP32?