Hello,
There is currently a known issue with 5G n28 with some carriers (mainly T-Mobile NL and KPN NL). For now, it is recommended to blacklist the n28 5G band.
This issue is with the modem integrated into the TRB500, and the manufacturer is working hard to fix the issue. You can track the progress here.
We apologize for any inconvenience caused.
Best regards,
DaumantasG