Sometimes simply moving a cable about with the prerequisite bending & flexing can change the sound briefly till it settles back in. Especially with active shielded cables.
But if you decide to ensure the connectivity path is as secure as can be...
DeOxsit the spades and posts... maybe twice, depending.
Then Pro gold or Walker-ize ALL the terminations... only a drop or two of either is needed.
Listen.
then drink as you wish. The sound will change following the drinking. Mine always did... ultimately the sound was muted. so much so I'd just pass out.
Now it's just old age that makes me pass out while listening, so I no longer need the alcohol... unless I'm doing 'rock classics' that night, they'll keep me wide awake!