Ping Fluctuating

Hi there. While gaming, I noticed that my ping goes up and down a good amount. This has been happening for months now and I've mostly been able to ignore it as it's relatively minor, however in games where better internet matters, it is really inconvenient. 

https://i.gyazo.com/ad9b883972fb3f4cc55ab9ce1afa7200.png

This is what outputs from cmd when I do a ping test. As you can see, it spikes up and down a bit. This causes notable lag which is especially noticible on game servers across the country from me. I use a broadband for my connection so it seems odd that it would be going up and down like this. I have also factory reset the modem, tried different security levels via the gateway, however this continues no matter what. If anyone has an idea of what the issue is, please let me know.