The 250 is the Edsel of the Sig line. I've owned dozens of Sigs over the years and NEVER had any trouble with any of them. Sorry for your troubles and don't give up on Sig just yet.
Thought I had an issue with my P228, but that's an older W. German made model. Turned out to be the ammo, but you know this, you were involved in that thread. My P239 and 226 have been flawless though.
My brother has the p290 and I have shot about 50 rounds thru it. I was not overly impressed. The trigger seemed gritty.
The 938 will be out in a month or two. It will cost more but looks very promising esp for those who like the 1911 platform. It is thinner and lighter as well.
The 250 is the Edsel of the Sig line. I've owned dozens of Sigs over the years and NEVER had any trouble with any of them. Sorry for your troubles and don't give up on Sig just yet.