I recently bought 2 T-Echo Meshtastic devices directly from Lilygo.
Both devices on default settings seem to repeatedly corrupt their flashed firmware. Reflashing them will undo the brick for a couple days, and then it happens all over again.
I have yet to discover what exactly is causing this issue, but suspect it’s beyond my expertise. For it to be happening on default settings, and simply by sitting on a desktop, seems pretty outrageous.
Not familiar with that exact device, but try doing a complete wipe before you flash. Flashing typically won’t clear the internal storage used in a microcontroller. Look for an option like “erase eeprom” or something along those lines.