NV - Intermittent latency spikes and packet loss, mostly in the evening

Ive been in the exact same boat since november, had about 15+ techs come out. with "field supervisors" and they all say the exact same thing, they will monitor the internet because nothing is found the time they come, they end up seeing the packet loss in multiple modems in my neighborhood. and then they go on to say they will get in contact with their supervisor, after a few texts they always stop replying. even after saying "just keep calling me at this point i want to get this fixed for you". it started small at first and it go super annoying, upgraded to gigablast, it got slightly better. and these past few weeks its literally unusable while gaming. non stop packet loss and latency veriation. atleast now when i run the speed tests on fast.com speedtest.com and cox website the download is for the most part steady, but ive been using the cox website because there it shows a high jitter, which i googled and it said anyting above 15-20 can cause latency and packet loss. my jitter was 40 just right now on the last test. I also live in las vegas Lakemead and Lamb. today we downgraded to the package we had before because its pointless to be paying 110+ to not be bale to use it on anything else than youtube. sadly the only provider in my community is cox so im stuck till they get it fixed! but i better get credit when its all fixed. LITERALLY SINCE NOVEMBER!