HI, thanks for the reply.
Sorry for the confusion. The stats shown in my original post were to give an indication of typical signal strength with an active Dual connection. When the connection drops to Single, then Single is displayed in the status page, in this case the connected band appears to always be Band3.
I am currently on Firmware version RUTX_R_00.02.01.1 and modem firmware EG06ELAR03A05M4G.
I realise that these are not the most up to date versions but I did update recently and completely lost the ability to connect at all. After a day of troubleshooting I rolled the firmware back to this version and connectivity was immediately restored. I am using the router in Bridge mode connecting to a Ubiquiti USG and during my troubleshooting came across a few posts highlighting similar issues. Having several people relying on this connection I was unable to allow anymore time for troubleshooting in an attempt to get it to work and, as I said, rolling back to my current firmware resulted in an instant resumption of connection.
When forcing 3G only I get a stable connection at something less than 1/3rd the speed of the dual 4G connection, which is to be expected. Stats for 3G are shown below..
Connection type 3G (WCDMA)
Signal strength -85 dBm
Carrier Aggregation Single
Connected band WCDMA 2100
Connected band -93 dBm
RSCP -3 dBm
So I have a stable (if slow) 3G connection and a stable (fast) 4G CA connection but when 4G drops to Single for any reason, internet connectivity is lost until CA is re-achieved. As I mentioned in my original post this feels like there is an issue with configuration rather than an actual fault with hardware/firmware, although that is just a sense I get. Any further thoughts or suggestions would be greatfully received.