Man, I feel like a jackass. Here I go, telling you that you've bought a great gun, and the next day you've got problems with it. Figures.
I know with some AEGs there can be issues with firing in different modes, especially semi auro, but usually I only see that in SAWs with a semi auto option. I wish I could help man, but I'm more of a gas gun guy.
Primary: KWA LM4 PTR, Classic Army LWRC M6 A2, Classic Army G36E, AGM/Javelin MP44.
Secondary: KWA Mk. 4 1911, KWA Mac 11, Skeleton Sidearms 8" .357 revolver.