Yes I had 781 btcd and now I have 0. I checked the address it was sent to and I have never seen it before.
Same happened to my on Dec. 23rd.
I had 1862 BTCD and when I checked my wallet on 25th there was a address the coins where send to : RR9CGV3bTMuJnofVzh5LBbGydQh59YW9oh
The transfer happened at 11:49 PM when I was still sleeping.
In you wallet open the console and run:
validateaddress RR9CGV3bTMuJnofVzh5LBbGydQh59YW9oh
Reply with what the output is.
I doubt coins are being "Stolen". Someone thought the same thing a while ago and it was simply staking. Staking occurs by sending aged coins to another address in your own wallet and then more gets sent back which includes you stake earning.