Fx Streamline 25 problems

My SL would shoot some really good shots and them a little puff on a shot. Then back to normal. I never shot groups. I would kill 6 or 8 sparrows in a row then miss a "chip shot" @ 15 yds.. Crazy.. I sent my SL to FX in Wilmington, NC on Monday.. keep us posted on what you learn. I do plan on changing the reg out to a "Hum' er" when the FX warranty runs out..