I have a Yaesu FT 101z HF Transceiver - whilst listening to a QSO the signal strength needle went off the scale and the sound went - after a few minutes the sound came back and then went again
It sounds like your RF GAIN control either needs some DEOXIT sprayed in, or replaced. Try turning the RF gain control when this happens and see if the signal returns. If it does, then live with it or try and find a replacement control. Also, you might want to try cleaning the plug in circuit board pins with a pink or drafting eraser. They do oxidize over time and the connections can get noisy.
Answers & Comments
It sounds like your RF GAIN control either needs some DEOXIT sprayed in, or replaced. Try turning the RF gain control when this happens and see if the signal returns. If it does, then live with it or try and find a replacement control. Also, you might want to try cleaning the plug in circuit board pins with a pink or drafting eraser. They do oxidize over time and the connections can get noisy.