Moving cables around killed dynamics for days anyone else experience this?

I've been experimenting with different cables between components. Nothing sounds right since trying to improve sound with new mix of cables. There is no bass and boring, highs are okay but life is gone from system. So I flipped everything back the way it was still sound horrible. Ran everything 24/7 for a couple days still no go. Let it run a couple more days dynamics are back and bass is full big and has tone again and enjoyable to listen to. Can someone tell me why this happens. I've also moved just speaker cables around without unhooking them and seen this happen, I don't get it.