In my case the WiFi remains connected, but somehow network traffic comes to a halt
every minute or so for 10-30 seconds, rendering my iPad2 pretty useless. My details:
* I have an iPad 2 running iOS 5.0.1.
* My wireless router is a Motorola SBG6580 router/modem.
* I had no WiFi problems until after the iOS 5.0.1 upgrade from iOS 4
* I have no problems with other wireless devices
* I used the "IT Tools" App on my iPad2 to test the network connection.
When pinging an IP address other than
my router, such as one of my ISP (Charter) DNS
servers, or a domain name such as google.com,
the ping test works normally for about a minute (about 40ms response every second).
After that the ping test gets no reponse for 10-30 seconds and
then goes back to normal. This repeats:
the per second ping test fails every minute or so for 10-30 seconds
(which is catastrophic for this device). I tried this for 10
minutes at a time. Overall loss is around 40% for the ping test.
* I did the same test using "IT Tools" with my router's IP address
and all the results were normal, showing that the WiFi remains
connected (the wifi icon was also at full strength (4 "bars")
throughout these tests).
* I tried using alternative DNS addresses (like OpenDNS) to no avail which is
not surprising given the ping results.
* In regular practice things like Safari constantly stall.
* I used PingPlotter on my laptop to do the same ping test,
all results were normal on the laptop, so it's not the router.
* On my router I disabled all encryption, n-mode, and WMM support to no avail.
* I tried using Settings/General/Reset/Reset Network Settings
on the iPad to no avail.
* I tried disabling as many network-related things as I could
find on the iPad, including bluetooth, iCloud, e-mail checks, etc.
This did not work.
In summary my iPad2 is pretty useless after upgrading to iOS 5, which
is probably due to a bug in the iOS network software.
Can anyone reproduce the ping results?