When you install a ujam plug-in for the first time, a hardware fingerprint of your computer is created the moment you open up your plug-in in your DAW. The fingerprint is a part of our copy protection.
If you use a USB dongle for your internet connection, your hardware fingerprint will change. In most cases, 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.
Please note that changing something on the hardware like adding more RAM or a new Motherboard will change the fingerprint and can cause the need to re-authorize every time re-starting your DAW.
As this is a rare and user-system specific issue, it is not easy to locate the cause for the problem. Please think about what hardware you're using and which device might change your system settings.
I you have any more questions or need further assistance, please submit a request to our support staff. Thanks!