That's a shame you have been waiting so long. Just like Ray M my issue was the magazine followers- I just had S&W CS mail me new ones, received in mail in less than a week. I installed them myself and so far I have been 100% reliable with about 250 rounds so far.
The old follower design was hitting my mag release tab that secures the mag in place - the new followers have a notch cut in them to prevent this from happening.
Here is a pic, one on bottom is new one with notch.
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