Issues after upgrading ram on my PC

I upgraded my PC to a 4 GB RAM to 8 GB RAM. In my haste, I did not notice that my PC was not shut down when I performed the upgrade. It was only on “Sleep” mode. After the upgrade, I began having the following problems:
While online streaming, the video or audio will initially be streaming just fine then all of a sudden it will slow and the video will become distorted.
When viewing movies or listening to music that I have in my PC, sometimes will become slow and distorted as well.
These issues started after the upgrade which makes me wonder if upgrading while on “sleep” mode had anything to do with it. Do you have any suggestions as to how to remedy these problems?
Thank you.
