I've been using the same settings all the time, but now when I play a clip either from media browser or the sequence it's all in slow motion. And after working for a while in the sequence it goes to normal without changing anything.
I did mess with some settings like modify clip, but that didn' help.
Strangest part is that even 24 fps clips are in smooth slow motion.
If that doesn't work, try resetting the Workspaces: Reset a workspace Reset the current workspace to return to its original, saved layout of panels. 1. Do one of the following: • Click the Workspace menu icon and select Reset to Saved Layout. • Choose Window > Workspace > Reset to Saved Layout. from here: https://helpx.adobe.com/premiere-pro/using/workspaces.html
If that doesn't work, try Preferences > Audio Hardware and set Input to None.