Vibrates randomly with no message

Anyone else experiencing random, long, vibrations from the epix2? 

it doesn’t display a message so I have no clue why it’s happening.

Looked at all the possible settings that might cause an alert and turned them all off.  So it isn’t something obvious like Move Alert.

It’ll go days without it happening, then it’ll happen twice in a day.

happens even when not wearing the watch.