Got a cz75 on trade and shot for the first time today. 2 mags with 3-4 stove pipes apiece and about 80% of the time the gun needed to be decocked to DA because even though the hammer was cocked, the trigger was completely limp like there was no mag in it. Some times pulling the trigger 2-3 times would cause it to work. Anyone got any ideas? I don't think I'm limp wristing it. Only have one mag so I couldn't try a different one.