Heard a beep-,
Thought we had a brownout but only thing effected is bathroom lights, outlet, and fan (different plugs). Switched circuit off/on couple times.. nothing! Everything else in house is working

Check for gfci. Sometimes people wrongly wire bath lights and fan on the load side of a gfci. Press test and reset gfci if one is installed, see if that fixes it.

Check your GFCI outlets to see if any are tripped