Had been noticing this issue for a while, with Facebook, Chrome, Messages refreshing constantly. I have the Pixel 2 and a Skagen Hybrid watch. After reading this thread, found that the refresh was occuring every time bluetooth disconnected or reconnected, which was occurring frequently because it was at the edge of bluetooth range with the watch in another room. Used IFTTT to log bluetooth connections and disconnections with the watch while the watch was in another room for an hour, followed by an hour wearing the watch with the phone nearby. In the hour tested with the watch in another room, I logged 32 connections & 31 disconnections - would cause 63 refreshes. In the following hour testing with the watch on my wrist, I logged 0 connections & 0 disconnections. If you find the same, disconnect the watch/turn off bluetooth when you're not wearing it to avoid the refresh issue. Might be the same with other bluetooth devices, didn't test using any others.
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