Emergency SOS is going off on its own - how to stop

Emergency SOS is going off on its own. This is a real problem.

I have an Apple Watch (4) and an iPhone IOS 11.0.3. Yesterday the Emergency SOS went off on its own. The watch and phone were unattended and stationary in my purse. 911 was called, as well as everyone in my Health app contact list but 1 person in the list. It was very embarrassing. (But why was 1 person left out?) Autocall was off on the phone, but on in the watch.

I then deleted all contacts in the Health app but 2. I turned Auto call off on the watch. 2 hours later only one of the contacts got another SOS from me. (I don't think 911 was called). I then got a notification on my watch.

I then deleted the contact that was called.

This morning at 5 am, the contact that I deleted yesterday was sent another SOS. The watch and phone were unattended on my desk. I got a notification on my watch but the time stamp was last night.

How do I get this to stop? I have turned off my watch and now don't trust it. My watch and phone are up-to-date(maybe that's the problem- may be there's a new bug.)

This is unacceptable.