Database Connection was lost

I don't know what to do. tried different things but after a little while. Server gives this error again and again after every second.
Also the ability to open SQL is gone. So i can't open SMC again or join SQL after this message appear.

Does anyone maybe have a reason for this problem?
Attachment 117029

push still same problem <.<

You can conenct to sql management studio ?

After this message not, before =>Yes.

Using sql 2008R2