Gateway constantly goes offline - speeds are about 1/3 of plan purchased

Since switching to Xfinity in January, I have been constantly plagued by my gateway going offline ( red light ) and having to cycle the power to get it back on.  Up until this week, it seemed to happen consistently around 130PM EST.  I spoke to a tech for about 45 minutes the other day who said they fixed it.. Now I have made it past the 1:30 pm mark for a few days, but it's showing Red when I wake up every morning and around 5:00 pm and 8:00 pm every night.  I have opened multiple cases, and was able to get through for 3 or 4 chat sessions of the 20-30 I have attempted ( they never put anyone in my queue or tell me they can't find me in Xfinity's system to assist me )  To top it off, when it does work, it is only 1/3 ( 300mbs? ) of the purchased plan speed ( 1GB ), and the signal speed is all over the place, we often have buffering on our streaming services, and devices dropping offline while in use.  I work from home, so I can't have my internet kicking me offline multiple times throughout the day.

I'm getting kind of tired of this - I have the cable pulled to the far end of my house - can I get a tech to come out and install the connection through my exterior wall closer to my main living area?  This will make it easier than climbing up to my ceiling to address the issue every time until they can figure out why my gateway keeps disconnecting - maybe a shorter cable run will improve my speeds as well?  I need some sort of resolution, or I will be leaving for a more stable provider.