Sig 320 sight wandering

Canadian2018

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Atlantic Canada
I bought a Sig Sauer P320RX (updated disconnector version) new, and put about 700 rounds through it. Installed the Apex Flat Trigger and Forward Set Trigger Bar partly through that, love the improvement.

Recently, I brought the pistol to the range after a cleaning, and immediately noticed the rear high night sight, which was factory set near the middle, was all the way to the left. I thought I'd have to use a brass drift punch to tap it to the centre, but was actually able to push it with my thumb!

Since then I've shot a hundred rounds, and it doesn't seem to have wandered away yet. Truthfully when shooting, I'm mostly concentrating on the red dot and the front sight, but I don't think the shift was gradual. Possibly I pushed the loose sight during cleaning and lube?

Is anybody else finding wandering sights on their P320? Am I right that the sight really shouldn't move in the dovetail with firm finger pressure? Any fix for it?

***UPDATE***
20190321:
Shipped to MD Charlton who replaced the rear sight under warranty.
 
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