Intermittent Signal Loss During Evenings at Apartment Complex

I pay for 1,200 mbps internet, and get that most of the time, but every evening I experience intermittent signal loss. This can be as frequent as once every few minutes and can last up to 30 seconds at a time. I am connected directly with an Ethernet cable and know that it is not an issue with any of my equipment. Is there anything that can be done to improve the consistency of my signal? I live in an apartment complex in a major city. My internet was much more reliable when I live in a rural area. Please see the image below. Thank you.