I have a COM-15093 qwiic single relay configured in a garage exhaust fan controller with all SparkFun components. All devices on the qwiic bus are 3.3V. Had been working for about a year, then stopped responding on the bus. I have a spare that I keep for development/test. Swapping that in works.
I see from other posts re an AVR programmer to reload firmware, but doesn’t seem to be worth the trouble to me, especially since these relays have SMD controllers, and I don’t know that that is the problem.
Would it be best to just send it in as a return, or try the alt address first?
Hmmm, if it randomly stopped working after almost a year I would wonder if perhaps the hardware had failed. Have you tried cleaning the device up with isopropyl alcohol(91%) and seeing if it functions after? It is possible that perhaps dust or debris could be causing issues.
It does sound like it could be related to the FM, though, I feel like FM randomly modifying itself after normal use for so long is certainly strange. It could be worth trying to upload new bootloader/firmware. Also, if you have been working with metal grinding, drilling, etc, metal particles can cause shorts and issues as well. Do you have the device in an enclosure by chance?
If all else fails you can submit a return ticket and we can look into a replacement, though, it does sound like you may be out of warranty.
The relay module was in a new 3-gang plastic box, mounted with simple home-made brackets (happens to be similar size/shape as a household electrical device), new wires, no dust/debris. I gave it an alcohol clean anyway, no change. Will have to dig up the order.