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Go to Settings > Wi-Fi and tap Menu > Advanced and then uncheck Auto network switch. That seems to have helped some people.
Try turning off the Note 3 and your router for a few minutes and then turn them both back on again.
Go to Settings > Wi-Fi and long press on the problem connection, then tell the device to forget it and set the connection up again
 
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If this does not work then
Go to the dialler
Type *#0011#
Press menu capacitive button
Go to wifi
Turn of power saving

Mine also disconnects randomly from my wifi. Says wifi connection unstable. But if I connect to it again it works fine.

Going to try the power savings feature and see if that fixes it.

Wondering how much more juice it will drain from my battery though.
 
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