Proton AM2 issue

Hi, everyone.
Hope this is the right place to ask..
I own this nice little amp with a problem that, while playing, one, or the other channel, shut off.
I was able to trace the problem to the input connectors. With the cover off, gentle bending the back panel, the sound reprise.
Is a known issue of these units? Defected PC trace, cold solder?
Thanks in advance for any tip.


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