I didn't see if you tried multiple 7 round magazines. You did note that a 6 round mag doesn't cause the issue.
My P938 works great with the 7 round mags. IMO, before you mess with ANYTHING you should call Sig. Maybe they'll send you another mag to try. Maybe they'll want to have a look at it.
You bought a not inexpensive pistol... one backed by a good company with a good warranty. My advice would be to take advantage of that- Sig wants you to be happy with the firearm. I'd give them the chance to make that happen before doing anything more than a good cleaning/lubing.
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