How many different types and brands of ammunition have you tried in your Ruger? If only one or two, you might consider branching-out, maybe trying something different. If you've only been using cheap round-nose/FMJ/FMC target/practice ammo, you should try something a little bit more powerful and see if that helps. Maybe some JHP defensive-type ammo.
If all you have used is the cheap steel-cased imported ammo, then the probability it is an ammo-related problem just went WAY up.
Also, make sure the pistol is lubricated in accordance with the instruction manual.
"Placement is power" -- seen in an article by Stephen A. Camp
(RIP, Mr. Camp; you will be remembered, and missed)