SIG P226, P229 and P220 100% with cheap Federal bulk pack and other cheap ammo. CZ Kadet, ditto. More expensive pistols (Walther PP, PPK, TPH) also no problem regardless of ammo.
Sorry, Mosquito is one of the guns SIG should never have let Umarex build in their name. Walther is also in there with P22, another disaster.
I understand if you polish everything (lightly) and get the right grease (fishing reel grease) the SIG Mosquito will work. Chamber, rails, etc. Very light polish on the chamber, check it to see if it needs such a thing. All 22s need to be kept clean, since 22 is exceptionally dirty ammo. Don't shoot plain lead ammo either, stick with copper plated stuff to reduce fouling.
Most of the 22s I get that "don't work" have a defect in the chamber, often too shallow, followed by leaded chamber / barrel ("dirty") followed by rough spots in the rails. I have fixed dozens of .22 pistols that were "unreliable". Lead ammo was often the culprit. Don't shoot the really cheap stuff, but bulk pack stuff should ignite reliably and cycle in any .22 you own. Your pistol can be made reliable, as long as you have a light touch and a stiff wrist. Another significant cause of failure to cycle is "limp wristing" -- give the pistol a firm foundation to cycle against.
Umarex should really stick to pellet and bb pistols though.