What model router and software version are you running?
How are you seeing the drop?
If you have an andorid device, install an app called wifi analyzer.
It can help diagnose WiFi issues if they are RF related.
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I am having a similar problem but I am not sure I can relate it to an update. My router model is FIOS-G1100, about 4 yrs. old. The wireless drops out and even when it comes back it asks for the security key again. Very annoying. Any ideas?
I copied the MAC address of my device that was having a difficult 2.4 connection and pasted it into my restricted access section of the 2.4 network. I still have SON on but since that device is blocked it can only connect at 5 and is much more stable now.
Since I do not have any FIOS routers to play with, for option two I am not sure if that if that is true or not.
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