I have just discovered this problem, luckily before i installed it.
I have tried to find a definitive cause as the camera does not always lock up when activating wifi.
things i am sure it is not:
heat
rear camera connected
duration of being power up
as a result of connecting to the phone
what appears to cure it is to cycle the power and then test by turning wifi on (wait a min after booting)
If the blue app message stays on screen it is wrong so cycle the power again.
It seems to not initialise correctly every time.