Unlocked Gofannon on my 2nd character and upon claiming the sniper frame that is given with that quest chain, the auto and hanccannon frames were taken away. I'm aware that bungie has stated this" [quote] Additionally, players who carry over weapon frames from prior weeks will lose access to one of the new week’s weapon frames after completion of the old frame in that week.[/quote] but as my experience shows, that's not the only circumstance. Simply having a quest chain from a previous week, even before the frame is given to you, is enough to trigger this bug. My other character is about to unlock Izanami and get the bow and I'm pretty sure I'll lose access to other frames on that character as well.