I suddenly have an odd behavior on a device that have been working well for a long time. Here’'s how it looks: https://youtu.be/GyLscO02UPE
It starts, blinks briefly white, then a solid red blink and then it restarts.
I can place it in setup mode and in DFU mode, so the chip is sort of working, but it’ll never run a program (not even Tinker). I had a similar issue before and then it was a matter of replacing the device keys. “particle keys server” executes successfully, but does not restart the device as it should. When I try to set the device keys with "particle keys doctor " it ends with the message “permission denied”.
I’ve replaced the firmware with Tinker and done a “particle update”, so it’s not a software issue. Any pointers as to what to try next?