My phone is charging weirdly.

About a couple of months ago I noticed that my phone wasn't charging properly, going from charging to not charging frequently. I tried with brothers charger in his room and it worked fine, so i went and bought a new charger for my room. It was fine for a month and then today i noticed that it wasn't charging with the new charger. I tried rebooting my phone and other options but to no avail. It works with chargers downstairs but not in my room. Is this a charger problem or is it my phone? This is the 3rd charger this year so far.