So this is a weird one. Restored from backup and started downloading all my apps. Left the phone in sleep mode and let it go about its business. Then it pops up and says a wifi connection is required. I went into wifi settings and there were no networks in range (normally there are 8-10) so i turned it off and on again a few times with no joy. Had to restart the whole phone just to make it see WiFi again. I haven't had this on any other iPhone so not sure if it's device/software/something to do with iCloud restore. Anyone else had a similar issue?