Premium Internet Slow and Constantly Cutting Out

I'm looking for a solution. I have called more times than I can recall at this point regarding this issue and yet I still have trouble with my Internet connection and speeds. I don't even bother complaining anymore since nothing is done except a reset, which only provides a temporary fix to get me off the line. It starts up again every time. 

Does anyone else in the Tustin, CA area experience this? Has anyone found solutions? I'm already paying for the higher speeds!

Thank you!