Tablet freeze and the screen blanked out ,when the screen came on again only the background screen is accessable and the tablet does turn off

may need an software update

Here are two things to try:
I- Using the Power button:
1 Press and hold the Power button for at least 4 seconds.
2 Swipe-down the shutdown confirmation screen to the bottom
edge of the display to turn off the tablet.
Using Charms:
1 Swipe-in from the right edge of the display to access Charms.
2 Touch Settings
Turning Off the Screen
Using the Power button:
Press the Power button to turn off the screen.
Using Charms:
1 Swipe-in from the right edge of the display to access Charms.
2 Touch Settings
NOTE: If your tablet is in a standby state (tablet is on, but screen is off), press the Power button or Windows button once to turn on the screen.
12
'
Setting Up Your Tablet
? Power
? Shut down to turn off the tablet.

II- Unplug the battery, wait 30 seconds, then install the battery again.

In case your Android smartphone is complete frozen and not responding to you at all, the above restart method won't work for you! To unfreeze Android smartphone that is dead froze, force restart it by holding the Sleep / Power key and the Volume Down key simultaneously until your device's screen goes blank.
This force restart key combo varies from device to device, so it is advised to check your device manual for the right combo. If your Android device has a removable battery, you can remove it and put it again and it will restart the device.

Triple click the home button. Then double tap the VoiceOver off button. This should allow the device to return to normal operation. Then you can reset by pressing and holding both buttons (power and home) until it resets if you need to.

You can likely free the power button by getting in the crevices (long nails work great) and pulling the power button out, or clearing contaminants. Additionally, you might have to access your hard drive through a computer and delete some app data or pictures to free memory and solve the freezing problem.

Turn it over on your lap or on something soft like couch or carpet. Karate it chop it on the apple logo. Start softly and keep using more force. Folks have even used a hammer to do this but I don't advise it. You can also drop it face down on carpeted floor. Your ipad is likely stunned and needs to be stunned again to return to normal.

Sounds like it's cheap junk if you wont it in an arcade.

Probably has an internal memory issue.

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it shows bubbles in the middle tablet and with blue and green line