I have put 150 rounds thru my BG 380 and I have had 15 malfunctions wherein the slide does not remain open after ejecting the last cartridge. It is closes completely. I've also had 5 failures, when the slide did remain but closed immediately upon inserting another loaded magazine. I don't believe these are independent of each other. Has anyone else experienced this problem and was the solution?

The usual cause with most any auto is that your ammo is a bit on the
mild side and is cycling your slide with just barely enough travel to
function. Another cause might be that you do not have a firm enough
grip on the gun.