Also please see if all of the antennas are correctly screwed on the device. Please clarify whether you use Teltonika original antennas, or third party?
I wanted to clarify your configuration. Are low signal reconnect setting switched on?
Also, do you use a manual APN? Are using Band lock functionality?
That is right, the comment about antennas was meant for another post. In your case I have sent you a form for private communication, please fill in the form, and in ticket ID provide this query ID which is 14799. This form should arrive to your personal email address used to register to this site.
We didnt receive any form for private communication . If this needs to be done in private please send the form at akajander@terna-energy.com and i will register a new account to your site