Routerboard firmware upgrade from 3.22 to 3.24 solved it!

And this is what the log says.

are you sure you have B7 or B3 network in there?

Yes, in Sweden we have several (at least 3-4) of them, including my wireless broadband company. But it won't even scan for them.

We've tried both 6.33.5 and 6.34.rc41.

We're trying to get our SXT LTE to connect, but the only thing that loops in the logs is "PLMN search takes too long, restarting".

If we try to scan for networks it says "error: info or scan not running".

Is it broken or are we doing something wrong?