I am wondering whether I have a tuning machine problem. Frequently during live sets I have to retune. It's never off by very much, but it's enough that it needs retuned. This affects our song pacing, I don't really want a delay while I rush to retune. My main bass is a MIM Precision Special Deluxe from around 2003. It has the original tuning machines. I have upgraded to a Gotoh 303 type bridge and had a new nut cut. The tech who did the nut is an obsessive perfectionist, and leveled a couple of frets too. From what I can tell all his work was dead on. I'm somewhat heavy handed, but definitely not a thrasher. After a slap/pop tune like Take Me To The River or Standin' On Shaky Ground a retune is always needed. Strings are LaBella Flats. Age of the strings doesn't seem to change the tuning issue. Do I need to lighten up my right hand, or do I have tuners that are creeping slackward during use ? Will a simple tuner upgrade from the MIM midgrade originals fix this detuning and let me thump away in happy ignorance ? Feel free to toss out crazy suggestions.