[Elecraft] strange broadcast band harmonics?

[Matt Murphy]

I was just tuning around 80m and noticed that my new K3 (SN 6066) seems to
be hearing all kinds of broadcast band stations (from the AM broadcast
band) on 160, 80, and 40m.   My other K3 does not do this at all, even with
the same antenna connected, which makes me think something is going wrong.
 I haven't noticed this before but this K3 is new and has not seen much
use.

Does anyone have any idea what might be going on?

Matt NQ6N