Yesterday i rode my bike to work and all was good. on the way home i noticed that my front brake lever felt very firm, i made it home ok and it was fine this morning when i rode in

now this afternoon on my way home I noticed the same thing, then when i got near my house the bike started to lose power and i could hear the front brake engaging. I made it home. I now probably need a new rotor and pads.

does anyone have the same issue with theirs. and if so what fixed it. If it matters the ambient temp is about 90* with a lot of humidity.