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Edit: There is no Event viewer entries for when Groove freezes, or at least none that I can find. I've also just noticed that when this issue occurs, I can also no longer navigate the Photos app with arrow keys, I have to close the image, then open the next one, instead of cycling to the next one in the app.

Edit (3:00 am): There is no Event viewer entries for when Groove freezes, or at least none that I can find. I've also just noticed that when this issue occurs, I can also no longer navigate the Photos app with arrow keys, I have to close the image, then open the next one, instead of cycling to the next one in the app.

Update (8:30 am): Thanks to @harrymc, remembered SFC and DISM. Ran SFC /scannow, and it found some corrupted files (which it said it fixed), followed by Dism /Online /Cleanup-Image /RestoreHealth, to make sure that the source SFC was pulling from was nice and good, then ran SFC /scannow again for good measure, this time coming back with no integrity issues. Fingers crossed that this fixed it, I really want to be optimistic.

Edit: There is no Event viewer entries for when Groove freezes, or at least none that I can find. I've also just noticed that when this issue occurs, I can also no longer navigate the Photos app with arrow keys, I have to close the image, then open the next one, instead of cycling to the next one in the app.

• Reinstalling Movies & TV and Groove Music

• Double click the mp4 from file explorer while Movies & TV is the default mp4 program. Result: Black window with no video playing.

• Context menu "open with" and selecting Movies & TV from file explorer on an mp4 while Movies & TV is set to default mp4 program. Result: Black window with no video playing.

• Opening Movies & TV from the start menu while movies and TV is set to default mp4 program, then opening the video from the library. Result: Video Plays.

• Setting Windows Media Player as the default mp4 program and double clicking from file explorer on an mp4. Result: Video plays.

• Setting Windows Media Player as default mp4 program and Context menu "open with" and selecting Windows Media Player to open an mp4. Result: Video plays.

• Reinstalling Movies & TV and Groove Music

• Double click the mp4 from file explorer while Movies & TV is the default mp4 program. Result: Black window with no video playing.

• Context menu "open with" and selecting Movies & TV from file explorer on an mp4 while Movies & TV is set to default mp4 program. Result: Black window with no video playing.

• Opening Movies & TV from the start menu while movies and TV is set to default mp4 program, then opening the video from the library. Result: Video Plays.

• Setting Windows Media Player as the default mp4 program and double clicking from file explorer on an mp4. Result: Video plays.

• Setting Windows Media Player as default mp4 program and Context menu "open with" and selecting Windows Media Player to open an mp4. Result: Video plays.

• Restarting my laptop "fixes" the issue temporarily, but it comes back after a few days.