If you want your Buds 2 to work with your PC (I have the Buds Pro) you have to disable Bluetooth on your phone and then re-do the pairing on your PC. And if you subsequently use your Buds with your phone, you'll probably have to do the same thing again in order to use your Buds with your PC.
Bluetooth ear buds were originally designed to work with phones, and that's how they are tested. The fact that Bluetooth ear buds can also work with a PC is a happy coincidence, but not guaranteed to be reliable.
In my case, I have a different set of ear buds (Soundcore) for my PC and my Buds Pro are for my phone. So you might say I paid someone to rid me of frustration. It works.