Problems with the Huawei P Smart?

I have three problems with my Huawei P Smart

Once, when I'm upstairs in the bedroom, the Wi-Fi often goes away, tablet is upstairs and does not have these problems

On the other hand, how do I finally get these standard pictures and the standard song away? Every time I delete these pictures and the song it is back on my cell phone after a few days

Third problem, when the default pictures are on it, my background image just disappears on the lock screen so I have to set it up again because when I wipe it through the pictures on the lock screen, I only see the standard pictures but not my picture what I do have chosen

Is your smartphone no longer guaranteed? The Asians are also known for giving a little more guarantee than the Germans. (Please, please, don't take it too seriously.)

Try to bring your smartphone completely to the factory settings + delete all possible data and files (manual), can also be a software error, does not always have to be the hardware.

I had tried that before, had brought nothing