I bought thie RUTX11 yesterday - and same problem with me. First action I did wa upgrading the firmware for the latest RUTX_R_00.07.00. I have the RUT 950 in my summer house, and it also started dropping the connection recently. When I go back to that place, I will check its logs.
I'm seeing in the event log that often when
2021-08-10 09:26:40 DHCP Leased 192.168.1.244 IP address for client
the same second
2021-08-10 09:26:40 Mobile data disconnected (internal modem)
It is not 1:1 linked with DHCP leased. Sometimes the lease was fine, but often the mobile data disconnected, which makes the device useless.
2021-08-10 09:24:29 Leased 192.168.1.244 IP address for client
2021-08-10 09:24:29 Mobile data disconnected (internal modem)
2021-08-10 09:24:32 Mobile data connected (internal modem)
2021-08-10 09:26:40 Leased 192.168.1.244 IP address for client
2021-08-10 09:26:40 Mobile data disconnected (internal modem)
2021-08-10 09:30:36 Mobile data connected (internal modem)
2021-08-10 09:33:22 Leased 192.168.1.244 IP address for client
2021-08-10 09:33:22 Mobile data disconnected (internal modem)
2021-08-10 09:36:54 Mobile data connected (internal modem)
2021-08-10 09:37:17 Leased 192.168.1.244 IP address for client
2021-08-10 09:37:17 Mobile data disconnected (internal modem)
When the connection dropped, the general status is telling "SIM 1 (not inserted)" or "SIM 2 (not inserted)". I tried both SIM slots. Now I am testing the another telco, which in my summerhouse is dropping in the RUT 950.