Besides the recoil spring issue that you mentioned, I know of a few. The older gen 2 & 3 G17's were having issues with the mags not feeding correctly at random times and gen 4's were having issues with the ejector not funtioning properly (throwing brass in the shooters face), the G22's were having feeding issues while there was a weapon light attached, and some of the 21's were having issues with mags dropping free, making one hand reloads very difficult. Other than that I'm unaware of other issues. I was told of the 17 issues by a ISP officer and on youtube, an IMPD officer told me of the 22 issue, and I learned of the 21 issue in this thread.
I noticed my G23 gen4 throwing brass in my face the other day. Had a few hit me in the forehead. First time I've noticed it and have shot 500+/- rnds through it. Actually had one case put a small cut on mu forehead.