Inconsistent water temps in my apartment.

I live in a building. My kitchen, bathroom bottom faucet and bathroom sink gets a hot temp of 105. Once in shower mode it’ll drop sharply to 80 and go lower. I called maintenance and they sent a person here friday to mess with a pressure valve. They then deemed the work as complete/resolved yet, I still have this issue. What do I do? My neighbors have even temps on all faucets and not I. I take showers when the water will get cold as well. I brought this up too but they’re guys doesn’t stay long enough for me to show them this. I did take pics today’s with a temperature gun for proof. There any advice so I can explain this better to the manager? I feel they don’t warrant a strong reason to call a plumber