It is working normally now , they were just investigating some issues with their block explorer , that what they said on their twitter account , I think you should not be aware of that , because it confirms that blockchain wallet team monitor everything happen to keep our money safe .
Yes that is true, but I shocked because I got alot of errors with viewing my balance so I thought it was gone or something, fortunately it was just a research they were doing. I will follow their twitter and check there first before stressing about the money I have there.