I latest firmware and loaded and software thingy91_ltem_v0.2.2.hex. And I get reboot all the time. It was working when I first got the kit then when I was testing this weekend it did not work. then I update modem firmware and latest app but got same error. I also build from source(master) but in all case I get same error.
Nordic Semiconductor ASA nRF9160-SICA [mfw_nrf9160_1.0.1]