I have not set the device to be offline. I am in a area with full, good 4G coverage, and the modem is connected.
Yet, most of the day I have no internet connection because the modem goes offline. How do I fix that?
Your firmware is quite outdated - can you upgrade to the latest version and see how it goes?
Yess. Just updated to latest version. And it is no better. Kind of worse actualy. Now when it is “Online”, it is dead slow and choppy. Does pretty much no upload.
Would you mind going one time through the factory reset process?
Asking as with a fresh config this shouldn’t happen at all.
Where do I find IPV6 setting?
Network->Mobile->general I can change APN settings, but I do not see the other tabs from your picture.
With 15 devices connected it will take a bit of work getting everything connected again after a reset. So that is like last resort 
Setting APN to auto(I was using a public one) did not seem to alter performance.
I have the same issue with several RUT200 with firmware 00.07.07.1 and also some 00.07.09.04, functional simcards suddenly disconnected, however the simcards are detected by the device.
We already tried factory defaults reset but no luck.
Only solution so far was to insert the simcard into a mobile phone so it could attach to the 4G network. After that, reseating the simcard to the RUT200 worked!
problem is I still have other 14 RUT200 offline and needing to go to each site to “fix” this problem.
Any ideas?
APN was set to AUTO, network operators also AUTO, as it has always been working, and we also tried setting manual APNs and manual network selection, no luck either.
Are you on IPv4 only as well?
[See my first screenshot]
Asking as very often you get disconnects when the (mobile) WAN connection starts flipping back and forth between IPv4 and IPv6…
Mine was already set to IPV4 only. Does switching off “Delegate IPv6 prefixes” matter?
No it doesn’t matter.
I’d go through a factory reset before losing further time on this.
Your 15 clients, leave them as they are - you will configure your old settings again and all of them will reconnect.
But step 1 factory reset, step 2 IPv4 only, Auto APN and observe and step3, if all is okay, configure your old settings as required.
Allright. First off I have to say that factory reset was a breeze! Went fast, the setup wizard aftwerwards had everything up and running in no time
But the result… Now I have not tested it long enough to say anything about connection stability. But performance is the worst I ever seen. I am in the exact same spot, with 4g+ and full bars on my phone who is using a twin SIM card. The X12 is getting <10Mbps and >250ms on every device I test! Android phone will give me 300-400Mbps doing the same test.
Settings that must be tweaked?
Connectivity issues are the same… Sometimes it is there, sometimes it is not 
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