Good evening all, iPhone SE - I've had it for just over a year now and I haven't had any issues at all; in fact, I've really enjoyed the iPhone experience. Just recently though, I've found that the iPhone disconnects from wi-fi when the display is locked. I know this because I no longer get notifications when the display is locked (I get them on my Mac so I know there are messages etc. waiting for me) and when I unlock the screen, the wifi symbol is missing and it takes a little while to come back. Multiple notifications then arrive. I do not have my mobile data connected all the time, because I do not have a huge allowance. I prefer to use it when I need it. The problem manifests even when the device is plugged in to my computer, and the mains to charge. I have spoken to Apple Support at length - we have checked all notification and wifi settings, and performed two factory resets but this has not resolved the issue. They also performed a device diagnostic but this revealed no hardware problems (and to be honest, I'm leaning towards software on the basis that everything works when the device is unlocked). I have an appointment booked at the local Genius Bar next week. I'm fairly sure there is some connection between the dropping wifi and using mobile data. On each subsequent reset, the wifi connection has worked fine even whilst locked (again, I know this because notifications arrive) *until* I have gone out and used mobile data. Then as soon as I get home: wifi disconnects when locked again. It seems as though the problem first occurred after the update to iOS 10.3.3 - I suppose one way to prevent wifi signals being hacked is to stop wifi from working full stop, but... Wifi works absolutely fine with screen unlocked; no drops, nice fast connection. Any thoughts would be much-appreciated. Whilst this is hardly a 'bricked' handset, it is extremely annoying. At the moment, I have auto-lock disabled so I can actually have conversations with people. Any thoughts would be appreciated. Many thanks in advance! EDIT: I feel I should also say that I have tried with two separate routers - one Netgear, the other Sky, and both present the same symptoms.