When you install a UJAM Instruments plugin for the first time, a hardware fingerprint of your computer is created, this is checked as soon as you open up your UJAM plugin in your DAW. The fingerprint is a part of our copy protection.
If you have a USB dongle for your internet connection, your hardware fingerprint will change. That is the reason why you have to re-authorize. The only way so far that you not have to re-authorize all the time is to avoid mobile wifi.