In have my Rut240 set manually (only 1 channel checked in the list) to a channel that has the best possible connection (4G Lte). But it still switches over to 3G channel with much worse connection at random which makes it unusable (poor download/upload)
I have to reboot the modem every time this happens and it is quite annoying. I have tried the "force Lte" option but it did nothing.