If USB MIDI Port names keep changing on your Windows computer when you attach your MIDI controller, unfortunately, this is a well-known issue on Windows, all the way back to Windows XP.
The solution to this issue is described here. It involves the use of a freeware (but please donate) tool from NirSoft called USBDeview.
Make sure you download the 64-bit version. Here’s also our Community thread in which this issue was discussed.
Another solution is to simply remap your controller in the Rig Manager, like described here.
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Related topics:
– Tips to troubleshoot your computer-based setup