With the wife and daughter shooting were they perhaps "limp wristing" the gun. I have had a pistol or two that if you did not hold it tightly with a strong grip it would fail to eject (stovepipe) and fail to feed. That is one reason shooting defense teachers recommend that you fire your pistol (in practice) using each hand in turn. If you get into a situation where your strong arm is immobilized and you have to go weak side, you had better know how to handle it.
Another thing to consider is the ammo if you are using bullet weights at the light end of the scale. Did you have the heavy bullets for that caliber or did you go instead to the light end? The light bullet might not develop enough recoil, especially with a limp wrist, to fully work the action.
With the LC380 being a new model there is always a possibility that you might have a problem with new technology. Have you contacted Ruger to see what they might have to say?
I replied to your PM. Not trying to be a killjoy, and am not a Ruger employee.
I see folks on the range who cannot make a Glock work. Among other things, I am an RSO and professional defensive trainer at one of the largest indoor ranges in the SE USA.
I do see folks who cannot make autos run every day. Glocks, Kimbers, Sigs, Rugers, etc.
Almost always, after a minute or so of instruction, they have success. Occasionally, some folks do not have the hand and arm strength to shoot these little guns.
Varsity athlete means nothing if she does not have specific strength and technique to shoot the mouse gun.
This is the reason a lot of "seasoned" trainers still praise the small frame revolver for a defensive tool. In a panic, or if injured, one may not be able to successfully deploy a very small auto. The wheelgun shines under adverse conditions.
I am no ruger expert and have no experience with a pistol like yours. I had trouble with a Ruger handgun in the 90's that was far out of warranty. I called them and made shipping arrangements. They worked on it an shipped it back no charge, and it functioned perfectly. I was impressed with the customer service. I bought two more Ruger products since then that function fine.