Hello again William.
Question edited for clarity and add your Tablet details.
Question moved to a Sylvania Tablet Category.
Ah okay, this post explains a bit better than the last one. Larger companies have Security Certificates to basically prove that they are trustworthy. The Certificates expires and have to be renewed. Some decide to, but some don't bother. On a computer, you can change a setting to ignore them, but not sure on an Android unit as I am an Apple iOS person, but the videos explain.
There is explanation here. Ignore the fact it mentions Samsung, Galaxy or Phone, the Operating System is the same as all are Android.
https://www.google.com/search?q=android+tablet+there+are+problems+with+the+security+certificate
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