Clearing Cache or increasing cache size resolves buffering issues?

I am experiencing unusual buffering delays while streaming on Kodi. I don’t know what’s causing the problem as everything else seem to work perfectly fine. I have tried different tricks to resolve this issue, even had to argue with my ISP regarding slow internet connection. However, the issue still persists. A friend of mine said that your Kodi’s cache might be full and that’s why you are experiencing a lot of buffering while streaming. Has anyone tried clearing or increasing the cache? Please help.

Thanks