Ok, so here recently I noticed that my soldering iron would not get hot enough for the solder to stick to the tip so I thought my iron was bad. I buy a new one a few days later and it works fine until about 8 PM and then it starts doing the same thing. I have been rebuilding my 3D printer and redoing a lot of the wiring to clean it up and was able to use my soldering iron all day again until around 8 PM. Now I have my printer all back together and was going to run some test parts and noticed that my hotend will not get over 150c. I checked the outlet and am getting 122v per my multimeter.
What would cause this? I don't know a lot about electricity so this has me baffled.