Probabily you got robbed by other player, if your server is pvp, or pve-c, other players can loot you if you are unconcious (loged off), on pvp anytime, on pve-c during de pvp time window. Check on your log the option to see unauthorized inventory access, if it was not a bug probabily you will see the name of the player who did it. Check your base too to ensure that no way to enter it, may he could used any glitch to enter, in this case you can report such player to funcom. Personal advice, even inside the base, aways logoff naked. I already lost stuff, to people using glitchs, bugs, got starved and soo. Hope you can figure it out.