945 LTE 17.28 Restarts on some phone notifications

I'm using 945 LTE for couple of weeks, migrated from 945. Watch seems to restart few times a week after receiving some notification from Android phone. E.g. I hear notification sound on the phone for Facebook message and when I glance my 945 LTE, I see green triangle of restart.
It doesn't happen for every notification, but I saw it at least 3 times this week. Any suggestions to resolve this?