Thats unfortunate that you are having so many problems with it, I own the same thing and love it.
My experience has been great with everything I have shot through it, sure there were a few FTF here or there but its bound to happen with a .22lr. I was expecting problems with the Rem. Thunderbolt I bought for really cheap one time, but was pleasantly surprised. A friend with a 10/22 had some real trouble with some of his ammo one trip, but I forget what brand that was. In comparison to other things, the .22lr ammo is cheap enough that I don't skimp on it. Thats not to say I buy the expensive match grade stuff, but the slightly more expensive ammo is *usually* better and *usually* makes for a more enjoyable trip to the range.
I honestly think that if the gun is properly cleaned and maintained, the ammo is to blame.
Without more information thats the best I can do, sorry.
You could buy an aftermarket extractor if you think the factory one is deffective or something strange like that. I bought a trigger upgrade and some 30rd magazines from the same website below. No problems with the order, shipping, or parts.