Was listening on 40 meters when I came across a very strong signal, i.e. S9+30-40 dB. I was adjusting the filter bandwith to check how AGC would handle this, and ajdusted the BW to 50-100 Hz and then back out to 500-1000 Hz, I noticed that the sensitivity was way down after moving away from the strong signal. Beeing away from the strong signal, adjusting the BW down to 50 or 100 Hz the sensitivity comes back with a slight pop. This anomaly could be repeated several times.