I have a serious problem with the RUT955.
The LTE connection is given, but the router quickly changes the connection state to the internet from online to offline. It's a real mess because I try to send mails automatically with a Raspberry Pi and if a mail was successfully send after some minutes the connection is lost already.
I already tried just to ping 18.104.22.168 before sending mails to trigger network traffic but this doesn't help.
The latest router firmware was installed.
The network topology is as follows, mostly.
Restarting the connection doesn't help always but sometimes.
I would love to get some help resolving this issue, many thanks.