No one knows, but maybe someone stole your coins.
1- The most important question, how this happend ?
2- What should i do, is there any possible way to restore my coins ?
I checked the address via explorer, more than 785 coins sent to that address on 19th Mar., days ago, not today.
https://www.coinexplorer.net/D/address/D8NjRhnBe25G1UA9AJXtbFLtn9EohUciCrThis one is your address:
https://www.coinexplorer.net/D/address/DCePSmzGhtoX5E5fj2kuRuYorQiwwJBxxaAll your coins gone.
No one can help you when your coins moved away to other addresses.
Question:- Did you use password for your wallet?
If not, it is your fault, next times, you should create as strong password as possible for your wallets, not only D wallet.
Yes, i noticed the transcation happened on 19th Mar today since i am not running my wallet that often - sometimes 1 hour each week
So last time i opened my wallet was on 16th Mar and then today
Question:
- Did you use password for your wallet?
If not, it is your fault, next times, you should create as strong password as possible for your wallets, not only D wallet.
No, i did not use a password for my wallet. My stupied mistake

Thank you for replying
