Most reliable .22lr semi auto pistols?

Ok so…….. I am looking to expand my collection of .22lr semi auto pistols but find one thing in common with most of them……when you shoot beyond 100 rounds at a single go….the second 100 starts to have some failures.

I currently own a Walther P22 and shoot it with CCI 40 Grain Round nose……first 100 from clean 1 failure or less…..around 200 around 4 failures and towards 300 around 15 or so……which is clearly the pistol becoming quite dirty at that point.