Could you try the following:
Login to the WebUI, navigate to Network -> Firewall. Enable the following option: Software flow offloading. See if that improves the WiFi situation.
What WiFi channel width is configured in Network -> Wireless section Global interface settings? Try switching between 20 and 40 MHz channel widths.
Also, can you confirm that you have a stable mobile connection, as the logs indicate continuous disconnects before generating troubleshoot file?
Could you try setting custom APN value according to your provider for mobile interface in Network -> Interfaces by editing mobile interface settings and disabling Auto APN option.
One more thing to check is to try different LTE frequency bands. You can modify bands in Network -> Mobile -> General. Try the following bands: B1, B7, B8, B28.