Exactly the same thing is with OnePlus 5 and many other phones. The app doesn't connect to camera until you wake up the phone. When the screen is off it doesn't connect. Once you turn on the screen even without unlocking the phone it connects and then stays connected even when the screen goes off. This crap is totally unusable. Every time you're goinf to take a shot you have to remember to turn on your phone screen.
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