I migrated V2 end node to V3. This end node uses Dragino LoRa Mini Dev, and works with ABP mode.
It sends data every minute. The end node worked correctly in V2. But in V3 it works almost 1 day and suddenly stops working. Have you seen similar problem?
Probably not related to why it may lock up, but why are you transmitting as often as once a minute ?
Your likley to be far exceeding the TTN fair use limit of 30 seconds air time a day.