Do you have a possibility to try GPS antenna, which came in the packaging of the router?
Otherwise, the attached log file indicates modem related issues. There are several instances, where it disconnects from he CPU, then, for a lengthy interval of time, it struggles to establish data connection.
Since GPS capabilities also come from the modem module, it might indicate hardware issues. However, the modem of the router uses a very old firmware, thus I would like you to perform an update. I will send you the instructions on how to do it in a private message.