Hi Cherry. Welcome to justanswer.
The issues you are facing are due to some hardware fault inside the tab. Most probably the problem is in the power circuitry. The battery is making a loose contact due to which it is crashing again and again. Is your tab still under warranty?
Dissebling the tab voids the warranty that's why they did not take it.
Ignore that offer as it is sent automatically by the website
Cherry I would suggest to take it to a local repair so that they can check the fault in power circuitry and if there is any firmware issue, they will install a fresh copy of firmware in it
The repair will not be expensive. It will cost you around £40 or less
Do you have any other query?
Cherry take it to a mobile repairing center. Can you tell me your area code?
CHECK OUT THIS LINK
Or contact this website
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Cherry if you have any query then do let me know.
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