I've googled this issue, because I believe it's a bug that has been introduced in firmware 3.0+. One of the hits I found links to a German MobileRead-like forum that's quite good! (It's in German though.) I noticed that a number of users are using a Fritz!box router, as do I. (It's made by AVM, a leading German manufacturer of broadband devices.) And interestingly, users of this forum had noticed that the Kobo was able to reconnect successfully if you set up DHCP on the Fritz!box to assign a fixed IP address to the Kobo.
It ought to work without a fixed address, so I feel it's a bit of a work-around, but who cares, it's working for me!
1. We have two Kobo's, an Aura HD, and a Glo. Both were working fine before 3.0+, and both are unable to reconnect until a reboot when upgraded to 3.0+. There are no issues with WiFi when downgraded to 2.10.
2. I have contacted Kobo Support, and they think the Aura HD is malfunctioning and want me to send it in for repair. I have a feeling it's software related however.
3. Both Kobo's work fine when they're assigned a fixed IP address.
4. It's not only an issue with AVM devices, other devices are affected too. I don't know if all AVM devices are affected, or only some.
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