I have owned / own several widows and they are all quiet. Run my brace height at 8-5/8 and 9.5 grains per pound arrow weight, shoot BW stock strings. I would shoot SBD but they take more time to get than I care to wait, but have tried them.
If you are shooting an old string you my want to change it to a new one, they do wear out. Or if you really want to be sure put an SBD string on it they are super quiet. If its still nosy with the SBD string on it there is something really wrong. If you shoot a tab that may also be worn out.
If your shooting a t/d check the alignment pins they can loosen up. I had that happen and its an easy fix, just super glue them back in and clamp. Also make sure your rubber o rings are good, I would just replace them.
Good luck, I hope you can find the problem because widows are exceptional shooters. Glen