I recently purchased a p700 premio tab. Today it will be 11 days old. Whilst browsing the net or I could be on google play the screen will go blank. I then have to press the power button so that the tab goes into sleep mode, then press the power button again, the device will go on again and the page that I was busy with will re-appear. Secondly I have ample space left to download apps however when doing so a window opens displaying "this device has no space. Since the purchase other than than the apps pre-loaded I have downloaded two apps onto the device. Please explain the reasons for this.