Using the RAK2287 and RAK2013 together?

Hello,

I’m trying to get the RAK2287 Pi Hat and the RAK2013 working together on the same Raspberry Pi. I’ve managed to get the RAK2013 working fine and reliably in isolation, and same for the RAK2287 with LoRa BasicStation. When I use both together they work initially, but after a short while the cellular modem fails and deconfigures itself, so the gateway loses connection and doesn’t come back up.

I’m aware that the GPS on the RAK2287 is connected to the same UART pins as the RAK2013, so my theory is that the constant stream of GPS output over UART is somehow causing the the RAK2013 to restart.

To make these boards compatible, do I just have to isolate the GPS UART from the RPi header pins? Or do I need to do something else?
Is there a schematic for the RAK2287 Pi Hat that I can investigate further?

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