gabacho4
Please use this:
a) /system logging add topics=lte
b) Watch LTE parameters: http://forum.mikrotik.com/t/r11e-lte6-2ca-not-staying-connected/136004/22
When you reach a “freez lte” then you should see what lte parameters are change/no-change and then you can found a “key” of behaviour to report it to MikroTik support.