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I have been using the device for some time with no problem. Yesterday, suddenly the network switched to 2g and shows as roaming. I have tried 4 different sim cards in the device, and all of them have the same issue.

I have upgraded the firmware to the latest version, but the issue remains.

All of the sim cards I have tried are working fine when I put them in a phone or iPad (connecting at 3g or LTE).

The network provider and APN settings are being correctly identified and loaded. I am using a UPC Mobile sim, and the device shows UPC Mobile as the connected network, but it also still shows the roaming icon.