We have an M-duino 19R and its ethernet connection to node-red fails intermittently -- about every 4 days requiring a 24V power supply switch-off switch-on to restart it. We are using Modbus through the RS485, have analogue inputs and an interrupt system for counting/timing switch closures. We are also operating all the relays. I would dearly like to solve this problem. I think the 19R we have is the older version with the RJ45 socket near the end of the top plate, not in the centre like current ones. Does anyone know whether this older version was less reliable?