My first handgun was a Ruger EC9s, it carried extremely well but sadly it had to go. It was my EDC for 3 years until one day the slide started locking back mid magazine. I tried new mags and a new slide stop with no luck. Sent it in to Ruger and they did get it fixed on trip #2. While waiting to get it back I decided to look into it again and I found out it was a somewhat common issue, the slide stop spring can go bad after a while.
I got it back, made sure it and worked and traded it in towards a 43x. It was reliable again but I don't think I ever would've fully trusted it again. That's not a knock on Ruger, I'm a certified Rugerholic but once a gun has issues it's hard for me to trust it again, with a few exceptions.