hi guys im playing tomorrow so need some advice asap, i have a A&K acr masasda its only 4 weeks old when i plugged the battery in it fires about 7 shots without doing anything. then when i put it on full auto and fire it will keep firing for around 2 secs without me pulling the trigger its mad how it does this ive tried all different batteries and still no change it works perfect on semi but its so unpredictable when you want it to stop firing but it keeps going for a bit any help would be great thanks luke