Short of a complete strip down and rebuild of your lens, there is nothing you can do about this, sorry. If you do choose to get the work done, then labour charges are very high unless the Nikon Authorised Service Centres in your country offer fixed price servicing.
It's either due to general wear or due to a thinning out of the internal lubricant films: it's their initial viscosity which provides just enough hold to keep the zoom ring in position so replacing them will resolve the issue as long as there is not excessive component wear.
On balance (and based upon frequent experience) it's usually just best to learn to live with the fault until you decide to replace the lens.
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