Disconnects on LHG LTE6 kit

HI,
every 4 hours i’ve a problem with this my first mikrotik. My config is very sample: i have a band selector on two band for 2CA, no dns, allow roaming, no sip service port and a lte1 to ether1 passthrough to lan1 fritz.box’s mac.
My os is last stable and modem version is 25.
Every 4 hours i’ve a lte1 link down, after 8 seconds ether link down, then up and it’s all ok.
In the conference call this is a problem.
Can you help me?
Thanks

May be it’s your operator who renew your ip ? (you can see that in the log). Mine change my ip every 12h …

I don’t think so. I’d have noticed before

enable loggins with topic=lte first.
You can additional use netwatch to create new log with information about up/down of access remotly host like 1.1.1.1.
With this two stuff you can start track problems with lte.