Not sure what happened here, but my knife wasn't working and then when I went to bandage myself my gun disappeared. You can see the gun disappearing on the radio menu between the actions. The shotgun is to the top right of the radio menu, watch closely.
Here's the link
Not sure what's causing it, I've that this happened three times to me now. One with an M4, one with an Lar, and now with that shotgun! This is a severe issue.
Please find what is causing this issue! This is no joke especially with how unfriendly DayZ is. And the bears and wolves are out of control so imagine being attacked right after this happens.