mp4 (from go pro 8) files plays choppy in premiere pro(video and audio)

An update: restart does help, but after a while, the problem returns. There are no problems in other video players.
 there is enough space on all discs.  Here  is my system info and my display info:
I hope someone can help

thanks for all the help.  I made a rookie mistake and didn't restart the computer before trying other solutions.
 restarting my computer fixed it!

Check the Audio Hardware Preferences. Default Audio Input should be set to No Input.

What is the footage like when it's exported?

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post (like this one has already been moved) if it helps you get responses.

<"moved from cc desktop bugs">

 I now realized that it is happening with all kinds of footage. what is wrong with premiere?