The audio settings on your camera are most likely the cause of this.
Welcome to the forum.
I agree with Harm. Camera settings, mic'ing technique, mic choice, or just Gain controls set too high would be where I would look first.
I'll check the camera microphone settings, athough its worth saying that i use an external wirless mic not the internal mic.
are there any sound settings within adobe on location?
and maybe... your laptop microphone was open as well.
that would be another possible reason as well, I'll check in the morning and report back.