Couple of possibles- dirty chamber, dirty bolt face/extractor, and a chamber mouth that has been peened by dry firing.
First, the EASY part- try a different brand of ammo. Autoloaders are notorious for being finicky on their diet. If that does not fix it-
Next, pull the bolt, scrub GOOD around extractor, face of bolt. Clean the chamber area. You may need to put a rod down the bore, attach a slightly larger than normal brush from the breech, and pull it INTO the chamber, while turning it. I cheat and use a drill to spin the brush for about 30 seconds, with a few drops of powder solvent.
Check fired brass for a bright line scraped into the side of the casing. Some 22s will hit the chamber mouth with the firing pin when dry fired. Done enough, this will produce a burr that drags on the brass. If you have a burr, DO NOT REMOVE IT- likely to produce reliability problems. There is a technique to IRON the burr back into place. Brownells makes a tool to do that- however, I am a cheapskate, so I use a Stanley nail set. DOES require pulling the action, bolt, etc, etc. so try ammo swap and GOOD cleaning.
Anyone else got any thoughts? Anyone? Bueller? Anyone?