I have a Galaxy S20 and the regular slo-mo is really odd. What happens when I take a slo-mo is it will stay slow motion for a second than it will go back to normal speed. If anyone has a fix that would be nice to know I looked through Google before my classes and still couldn't find anything. Thank you in advance for any possible help!
I found a temporary solution until they fix the bug. After you take a video, Go to gallery and click on the video. then click the edit button. You will notice that the video appears to be trimmed. Move the sliders to cover the whole video. Now just back out. There is no need to save. Now if you open the video and click play slow motion video it will play like it's supposed to. It appears that the original bug is with the initial saving process. hope they fix it soon but got a workaround in the meantime