PP CC Preview lags out of a sudden

[defaultv9o4rdtp1fke]

Yesterday any video had no lag and run smooth. Since today even the smallest video lags awful in the preview window.

I tried the common fixes like:

• turn GPU Acceleration on
• delete the media cache
• lower the preview resolution
• assign enough RAM for PP

My System specs:

• AMD RYZEN 9 5950x
• 32 GB RAM, CL16, 3600MHZ
• 1 TB Nvme Memory Card with 7000MB/S for reading
• GTX 1050 TI GPU  

Thank you in advance.

[Ann Bens]

FAQ: How to reset (trash) preferences.

[defaultv9o4rdtp1fke]

unfortunately it did not help 😞

[Peru Bob · Accepted solution]

Delete the Media Cache and Media Cache files:
https://community.adobe.com/t5/premiere-pro/faq-how-to-clear-your-media-cache-in-30-seconds-in-premi...

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.

If that doesn’t work, try updating or rolling back your graphics driver directly from the video card manufacturer’s site. If NVIDIA, do a clean install of the latest Studio Driver (NOT the Game Driver)
https://community.adobe.com/t5/premiere-pro/faq-fix-for-nvidia-gpu-crashes-when-using-a-laptop-on-wi....

If that doesn't work, try creating a new project and import the old one into it.

[defaultv9o4rdtp1fke]

Thank you the following step worked:  If that doesn't work, try Preferences > Audio Hardware and set Input to None.

Now it runs smooth again 🙂 but what is the reason for the problem?

[Peru Bob]

I don't know why it works.  If it works, it works. 

[Michael Grenadier]

Please tell us which version of premiere you're using and your source properties and sequence settings.  Make sure you have at least 20% free space on your startup drive and at least 10% on all media drives.    And it's possible your media drive is failing.  Might test the read and write speed of the drive.