Making sure yours and your guest's internet speed is fast enough is an important part of being able to record a stress-free recording.
You can run a speed test at www.speedtest.net.
If you are in different cities try and select the city to run the speed test to that which is closest to the other's city.
If you are getting up/down speeds that are under 1.5 Mbps then this can cause the connection issues. You want at least 1.5 Mbps up/down and hopefully 5 Mbps or more.