I have a pixel and just upgraded to a pixel 2. I have used the DJI Go 4 app on both phone versions and using the new firmware .900 and the app .15 (not .18) I am having no issues with connectivity and using the OTG cable.
I use a Google pixel phone and have great results. I lost connection once or twice but got it back immediately.... Some video lag but very very minor. Going to try the otg cable just to see if there are any improvements.