The logs do not indicate any issues.
However, there is quite a number of wireless clients connected to the device. Then there is one device under IP of 192.168.206.189, which spams DHCP requests every 3 seconds. I would assume, the router is simply unable to handle the load. However, to check this, I would suggest to, if possible, disable WiFi interface and connect the device you want to download the file to via ethernet cable and see if the router still freezes during the download.
Otherwise, you could try to change the memory the logs are saved to Flash in System -> Administration -> Troubleshoot section and generate another troubleshoot file. This would save the logs even after device reboot, which might reveal some error messages before the “freeze“.