This has been an issue on wifi cards as well. If you don't have TLP & TLPUI installed, you can use apt in the terminal to quickly install both, sudo apt install tlp tlpui. You can go in and either turn off power saving for the broadband card or you will have to restart. I'm not sure of any other fixes at this time.
Since suspend releases hardware and the services that manage them prior to powering down, there may be a script you can set up that allows the restart of the service upon wake, but you will have to search this. Most individuals don't have a cellular card in the laptop. You are the only one who can test these things and find a solution. I can't replicate this because i don't have that hardware.
Yes Ocka, I saw an option saying allow usb port charging when sleep, while it was already set.
Then I find when on battery power, the first time it wakes up, the LTE is gone; but the second time it is back. Another thing, every time it wakes up the screen is off, while the screen is on on other laptops.
Finally I seem to get it. There is "sleep mode" option in BIOS. I changed it from "Linux S3" to "Windows and Linux", and the problem does not reproduce now.