So finally got to take my new DE 50 to the range today. Every round fired, every spent round ejected, but when the slide returned to battery, it would not pick up a new round on the way Did this every time ! I took that mag apart and stretched the spring a little, when I fired again, it actually loaded a second round for the first time, but then back to same issue - never loading a new round. I am using Magnum Research ammo. Is there anything other than weak mag spring that could cause this ? Didn't have a second mag to test. Thanks!