This has been an ongoing problem for years. Glock screwed up the dimensions on either the slide or frame. Some are fixable, some are not. I would not waste the coin trying to fix what shouldn't be broken sending it back and forth, and wouldn't touch a new Glock with a twenty foot pole.
DGMW, I love my G32 I bought in 08, its flawless. Thank God I bought an entire parts kit for the gun, I can fix anything that breaks except the slide or frame.
My last two 'new' handgun purchases both had to go back to the factory for problems. I kicked both to the curb. I buy only 'at least ten years old' now.
It's a shame the trend in the business world has been to cheapen products to the verge of non-useability while increasing profits to the maximum.