My SIM card provider has set mandatory roaming ON. Still the only allowed connection is for ISP vendor ICE.
I have locked the ISP with a manual profile, a fixed Band (B3) and 4G Only.
Still, the modem is disconnecting now and then (every 50-70 second). SIM tested flawless on iPhone.

Log entries where the 3rd line says network disconnected, but it should not. The Carrier seems strong with 100Mbit/s download speed.
The SIM setup and the FW seems to not be a good mix. The FW should handle this. iPhone manages. Is this a known bug. Is there any release coming with such a fix?

2026-03-27 12:51:36 [6] 4G: LTE connection up
2026-03-27 12:51:36 [5] 4G: LTE internet connected.
2026-03-27 12:51:58 [6] 4G: USER: The network disconnected, start autoconnect!
2026-03-27 12:51:58 [6] 4G: USER: Get user's profile now.
2026-03-27 12:51:58 [6] 4G: USER: GetCurrProf result is:  ipver:0  staticApn:0  authType:0  pkgName:Ice  profname:Ice  apn:  usr:  psw:  
2026-03-27 12:51:58 [6] 4G: USER: ModifyDefaultAttachProfileIP attach ip ver  equal to profile
2026-03-27 12:51:58 [6] 4G: USER: Get user's profile now.
2026-03-27 12:51:58 [6] 4G: USER: GetCurrProf result is:  ipver:0  staticApn:0  authType:0  pkgName:Ice  profname:Ice  apn:  usr:  psw:  
2026-03-27 12:51:58 [6] 4G: ERROR: Bind mux port session 0 failed (0).
2026-03-27 12:51:58 [6] 4G: USER: Fail to connect to the network, start autoconnect!
2026-03-27 12:51:58 [6] 4G: USER: Get user's profile now.
2026-03-27 12:51:58 [6] 4G: USER: GetCurrProf result is:  ipver:0  staticApn:0  authType:0  pkgName:Ice  profname:Ice  apn:  usr:  psw:  
2026-03-27 12:51:58 [6] 4G: USER: lte_sms_status_valid invalid .
2026-03-27 12:51:58 [6] 4G: USER: The service is not available.
2026-03-27 12:51:58 [6] 4G: USER: Not registered, searching!
2026-03-27 12:51:58 [6] 4G: USER: Network type is NONE.