- First try this: Your charger is bad and isn't really charging the battery to 100%. Try a new charger. Do not use solar for testing the charging, use a good quality wall plug charger. Cheap Chinese ones can damage your device (rarely, but it happens).
- You might have a bad wifi indicator. It's says wifi is off but it's on.
- You might have a bad battery. This happens sometimes even with a new device.
Here are some charger reviews:
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http://www.righto.com/2012/10/a-doze...-apple-is.html
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https://www.techspot.com/news/51965-...t-ul-mark.html