It sounds like your computer is defected with some viruses or trojans. So first, move all your btc to another wallet and I recommend you to use mycelium wallet if you have an android device.
Secondly, format your PC and install a pure , clean operation system.
thanks for advise will test mycelium wallet in my android phone
Bloclchain security is just a big pile of joke
It's really easy to hack since they have lots of securoty vulnuberality (not sure if i spelled that right)
I used to own coins on blockchain with secondary password and 2FA
Guess what
THEY MANAGED TO BYPASS THE 2FA
They took few of my coins that way
Anyway, i now using desktop wallet which work flawlessly
sorry for your lost bro
already activate second password mean when i want to send some BTC i need to put second password
cant use desktop wallet at this time bcz i have very slow internet
but if i really have trojan in my laptop he can stole my wallet.dat no ?!