Yes, this is also quite common on Amazon reviews as well. The firing problem is that the first shot doesn't seat and fire properly, so it jams the first shot in the gate or before the gate, and chambers a second round and the first one stops them both from seating and firing properly.
I have had the same problem with my sons Raider. In rapid fire mode, every third one will just fall out of the barrel. Serveral bullets have become damaged beyond use. I think the problem is that my son over loads the drum magazine and uses damaged/smashed bullets as well. At least I haven't had to take one of those apart.