Two suggestions from high round count experience with multiple examples of this same design:
Indeed, the early guide rods were prone to failure. GSG comes with a 2yr warranty but perhaps if you call, maybe they'll send a new guide rod for free.
As to the accuracy problem you are experiencing, I can tell you that with my pistol, if you have removed the screw and removed the barrel from the frame, expect anywhere from 30-50 shots after reassembly before the pistol "settles" back in to a repeatable groove for the accuracy to return. And either way, I've never seen more than "acceptable" accuracy from it, certainly find for plinking fun but never a target quality performer.
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