FAIL. This is not the normal response with Sig Mosquito owners. Most will tell you they are very picky about ammo and not as accurate as most other .22LR pistols. I was an owner and got rid of mine because it just was not reliable.
For semi-auto, I've always heard good things about the Ruger Mark III, the Browning Buckmarks and the Walther P22 (if you can get past how small the gun is).
I would stay away from the Sig's as they are ify with a lot of different ammo's.