I have two 802.11N routers at home, a Linksys EA3500, and Trendnet N950. After waking from sleep, the phone never reconnects to WiFi and I have to manually disable and enable using the Wifi logo on 'settings' screen. The behaviour is same when associated with any of the two aforementioned router.

But at my workplace we have a Cisco access point, and the Jolla phone almost never disconnects from it, even after waking from sleep.

This is very strange.