Ditto. stopped working about an hour ago. Except mine has NOT started working. Tried a reboot and switched on and off. nothing so far. Also none of the quick gestures for camera and flash light are working either.
Double Tap to Wake was always funky on my OP6T too. I just hit the power button. I've had it crop up once or twice on the 7 Pro so far as well as some other touch issues. Nothing major, but it is a little annoying when it happens.
Spoke to OnePlus technical support. Clear the phone cache seems to work! YAY!
1. Turn the phone off.
2. Hold Power and Volume Down
3. English (or pick any language that you want)
4. Wipe data & cache
5. Wipe cache
6. Yes
7. Reboot