Been using the router for a while on Vodafone 4G. Suddenly, this morning, it can't find a 4G connection. if I put it into 3G only; it works fine. 

Hers what the log says, Doesn't mean anything to me, wondering if anyone can help me understand whats going on.

2021-03-13 15:34:33 [5] 4G: LTE internet connected.
2021-03-13 15:34:51 [5] DHCPD: Recv REQUEST from...... "REMOVED"
2021-03-13 15:34:51 [5] DHCPD: Send ACK to ..."REMOVED"
2021-03-13 15:37:51 [5] 4G: networkPreferredMode: 2
2021-03-13 15:37:55 [6] 4G: USER: The service is not available.

2021-03-13 15:37:55 [6] 4G: USER: Not registered, searching!

2021-03-13 15:37:55 [6] 4G: USER: Network type is NONE.

2021-03-13 15:37:55 [5] 4G: lte internet disconnected.
2021-03-13 15:37:59 [6] 4G: USER: Get ISP's profile now.

2021-03-13 15:37:59 [6] 4G: USER: GetCurrProf result is:ipver:0  staticApn:0  authType:2  pkgName:Vodafone UK  profname:Vodafone UK  apn:wap.vodafone.co.uk  usr:wap  psw:wap  

2021-03-13 15:37:59 [5] 4G: set LTE static IP connection, needSetDefaultGw:1
2021-03-13 15:38:15 [6] 4G: USER: The service status is limited.

2021-03-13 15:38:15 [6] 4G: USER: Registration denied by the visible network!

2021-03-13 15:38:15 [6] 4G: USER: Network type is LTE.

2021-03-13 15:38:30 [6] 4G: USER: Cancel ussd session.

2021-03-13 15:38:30 [6] 4G: ERROR: QMI VOICE Cancel USSD Failure