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Help Intermitten wifi "Authentication Problem"

For over a year, my android tablet (Chinese model) has been working fine on my home wifi network with the same router and the same password. Recently, it starts to have a wifi "Authentication Problem". After connecting to wifi and working for awhile, it will be disconnected. When attempting to reconnect, the tablet would report an "Authentication Problem" message. The only way to reconnect is by rebooting the tablet. But the same problem will recur.

Would appreciate suggestion on how to fix this. TIA.
 
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