Hi Rune,
I just realized, that after some time running, the device stops reading RFID tags.
While the node MCU keeps pinging (you can ping the IP address of the device and it is up), if you approach a RFID tag to the reader it does nothing (that is: no blue light which means is not reading/processing the NFC). But the green light is still ON, which means the device is “kind of working”.
Any thoughts? Thanks a lot.