Why does the sound disappear in one column of music. center?

Question

Electronics

There is a music center Panasonic SA-AK15
Connected to a computer via AUX.
You connect a new cable (3.5 - Two tulips (red / white)) , really, 1 month passes and the sound starts to disappear on the same channel, it appears when you move the cable a little on this channel (up / down), but every time the sound this channel is getting quieter and quieter. The other channel always works fine. You buy a new cable and the sound becomes normal everywhere, but not for long. I bought both cheap cables, and thick expensive ones, with different braids - the result is the same. The cable dangles freely, without tension.

At the same time, I have another old Sony RX50 center, the wire has not been changed there for 10 years. What could be the problem?

Is the problem in the center or poor quality cables?

Answer 1

Once repeated on different cables - it means the matter is in the center connector.
And the cable wiggling is on the center side, right?