Hello to all
My name is Davide and I'm Italian.
I use this 4G router with my TIM operator.
I have some problems:
1- I noticed that the router a often changes "band" by itself and goes from "band" 20 to 3.
When it is on "band" 20 the line is unstable, the speeds are:
Download: about 2Mbps
Upload: about 14Mbps
instead with "band" 3 the connection seems apparently more stable and speed are:
Download: about 22Mbps
Upload: about 5Mbps.
However in 4G LTE the line is always very unstable:
Signal Strength: 75%
RSRP: -107dBm
RSRQ: -11dB
SNR: 6.0dB
This data is detected when the line is going well enough, but a video the live streaming is buffering often (for example Twitch).
The question is: Is it possible to set the "band" statically?

2- If I change the "Network Mode" from 4G Preferred to 3G Only, the line is apparently more stable:
Signal Strength: 100%
RSSI: -79dBm
with the following speeds:
Download: about 22Mbps
Upload: about 5Mbps
But a strange thing happens: after a few hours (random) the router apparently works but in reality hangs, I can no longer connect to the router page and the connection obviously disappears (like a freeze state).
I have checked that I have the latest firmware, but I cannot solve these problems.
Now I don't understand the signal noise levels, but maybe if you help me understand how this data works, I would like to find the optimal position of the router without having to change the telephone operator,
or try to change the 4G antenna of the router maybe with a more performing one that you recommend.

Thanks a lot