Video Streaming Recently Started to Slowing Down

Should I replace my Arris Surfboard modem SB6190 with a newer faster modem?

Streaming videos taking longer to load recently ( about 4-6  weeks ago) when before I had no similar issues. 

Going back quite a while I replaced my modem for the SB6190 and experienced quite an improvement in my streaming videos and internet without moving my Xfinity service from my low tier. 

This brings me to wonder if could experience some similar effect with the next DOCSIS 3.1 technology or at least not get a negative effect for upgrading?