Hi,
I just purchased RUTX50 and problem is that 5G cell is not found/connected and in general low throughput.
Within 500m there are two operator's cell on opposite directions. Cells have LTE bands 1, 3 and 20, and 5G band 28. I have seen this 5G cell on Network - Mobile page couple times briefly (few seconds), otherwise only those LTE bands are used. Also SINR of LTE band 20 is very bad. Built-in and speedtest.net Speed Test gives usually only 160Mbit/s DL (few times above 200Mbit/s) and 80Mbit/s UL. I have 600Mbit/s operator subscription. In my opinion this 160Mbit/s is low even to 3CC LTE CA.
Both LTE band 20 and 5G band 28 are low frequency bands that supposed have less fading (better quality on indoors) than higher frequency bands. I am suspecting some kind issues on low frequencies. I tried also better external antenna, but not improvement.