Lube problem? Weak return spring? High round count? Possibly something is just worn out from use. Maybe it is time to trade in for one of the newest ones that are supposedly more accurate due to Ruger finally setting up and taking notice of aftermarket accurizing work on them. And you could presumably keep your accessories, like mags? I am assuming they all take the same mags.
Your gun is like your nose, it is just wrong for someone else to pick it for you!