Welcome to the forum
First of all, don't panic. We get this reported here quite a bit.
At the bottom of this page you will find a list of similar threads - when you are in those threads, you will see others related to them in the same location on the page. It doesn't matter if the model is the same as yours, the solutions (which vary a little from device to device) are all worth trying.
Take a look through those threads & I am sure you will find a solution.