There's not a lot of information to go on here, so all I can do is give you my best guess, but I have a feeling that I know what this is...
https://forums.adobe.com/thread/1195540
There's this really common mistake that many video publishers (including major US television networks) make when inserting commercials into their video streams, where they forget to mark those commercials for deletion after they play. What ends up happening is that those commercials stay in memory (we can't delete them because they think they're in-use), and eventually that end up being a huge amount of memory -- especially if you're streaming a movie or a few episodes of a show.
Eventually, that consumes enough memory that the computer starts swapping data in memory (RAM) to disk. Data transfer on the disk is about 100,000 times slower than data transfer in RAM, so that tends to correlate with an overall performance hit. Restarting the computer would resolve that. Refreshing the page that you're watching the video from *should* also work. The browser is going to release that instance of Flash Player and start a new one when you refresh the page.
If refreshing the page doesn't work, then there's probably something else happening, and it's really hard to say what's going on. It would be interesting to take a look at task manager when things aren't performing well to see how things look in terms of CPU and memory consumption.
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