ST P-Nucleo-LRWAN2 stopped working

[DashCanTtn]

The above-mentioned post links to:

Only activation, No uplinks downlink,ack received on TTN Console

This is likely a case of getting lucky in randomness, or at most a complete transmit failure. Gateway timing would be unlikely to be at fault, as the downlink RX1 for a join is quite long after the uplink - there is plenty of time. Please be careful not to mix up the terms uplink and downlink however - what you are calling uplinks are actually downlinks. Uplinks are node to network, downlinks are network to node. Additionally a RAK831 is just a concentrator card. If something is going wron…

One thing noted there is to keep the Device >8 feet from the gateway.
Mine was under 1 foot, but moving it >12 feet away has made no difference:

(screenshot upload failed again)