Milesight UG56 Gateway disconnects from TTN after a few hours

Hi everyone,
Have some of you tested the milesight UG56 industrial gateway (UG56 Industrial LoRaWAN® Gateway | Milesight IoT)?
I configured it for TTN, using the Packet Forwarder. It connects correctly but disconnects after a few hours (and never reconnects untill I switch it off and on).
The support from Milesight is very slow (it takes them several days to answer to a support request) and I’m wondering if it is worth digging deeper or if I will loose my time.
Thanks in advance,

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Probably a lack of power or stability in the POE power supply. Switch to USB-C 5v-2A power supply