I have a EE UK SIM in SIM1 and a backup Vodafone SIM in SIM 2 within a RUTX11 (latest firmware). Switching manually or automatically to SIM2/Voda happens seamlessly, with connection established within 10 seconds. However, when switching back to SIM1/EE, the connection take 1-2 mins to get established. It's has a solid -51dBi signal quality and we have line of sight. I am using auto APN, and the correct APN details are populated - it just takes far too long.
Any ideas on what could be causing this, or things to troubleshoot? Network screen details attached.
Thanks for the help!