the link you provided doesn't work: "Sorry, but the requested page could not be found."
I don't think there is anything wrong with the SIM-card, I used it for years in the same location but in a RUT955.
Reason for changing to the RUT240 is that my old RUT955 did not support the possibility to select which frequency bands that should be used. Signal strength on B20 (800 MHz) is good, average last 24h around -60 dBm. But signal to noise ratio is not very good.
I am using an external cross-pol log-periodic antenna.
I have selected to use WCDMA 900 and LTE B20. I can remove the WCDMA 900 option to see if it make any difference.
Without this option to select frequency band, sometimes 1800 MHz is selected and then there is a high packet loss ratio.