Today i saw that my RUTX11 (modem) was down between 23.00 pm and 03.00 am.
Any idea for the reason?
Im afraid the router would be dow on daytime.
I will check it tomorrow again.
My guess is leased IP got expired from the mobile operator 
How often does this happened? Because there’s a chance that the CG-NAT Ip that you received got renewed after some time.
Unless something is really going on, I’d recommend accessing the CLI of your router via SSH (or WebUI), then use the command logread to get detailed logs. This way you can get more idea what might be causing the issue.
Check the uptime of the router, see if it was actually powered down during this time (uptime should be relatively recent) or if it was an issue with your mobile carrier. Perhaps your mobile carrier was performing maintenance at this hour and your device did not have any other tower cells to connect to?
In any case, if this issue does not repeat itself multiple times then you’ve got nothing to worry about.
In the last days there was no longer modem-shutdown. Only a few seconds.
So i think the tipp from bored_gato is interesting:
Is it possible to restart the router automaticly once a day preferably in the night, to get a new IP for the next 24h?
Maybe it’s better just renew the connection.?!
But how to do it automaticly?
Yes
That cannot be done from the GUI.
You can do it using a job from the commandline if you wish to pursue that.
It is possible using the Reboot Scheduler found at SYSTEM > MAINTENANCE > AUTO REBOOT > REBOOT SCHEDULER but when setting up, select ‘Modem Reboot’ NOT ‘Device Reboot’.
Given that you are now just losing connectivity for a few seconds, then this can be considered normal behaviour in my mind.
As @r.janssen has said you can also do this using the CLI command line but it would mean you staying awake until the hour you wanted the IP to be reset. OR you could use the Scheduler method above to just run the Modem Reboot once.
Note that irrespective of the method employed, your IP lease start-time can change, without informing you, due to any number of factors e.g. dictated by your carrier, drop in signal forcing reconnect etc.
@all: Thanks a lot!
I will use the scheduler-method for restart the modem once a day.
No, you can actually schedule a commandline command from the SSH prompt by using “crontab -e”.
But you have to understand how the crontab works (generic Linux/Unix knowledge).
I did not do that, I just scheduled the reboot as described above. It works.
I stand corrected … thx
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