Any way to check if my AirPort card is going bad MacPro 2013?
You can use Apple Diagnostics to run a hardware check on your computer. Instructions for doing that are found here.  Your computer is on the borderline for computers using Apple Diagnostics. If you computer is from before June 2013 you have to use Apple Hardware Test. There is a link in the reference I included for this older hardware test.
If you are using an Apple Base Station, you can check that you have the latest software for your base station. This link describes what you should do to keep your airport base station up to date.