Hello, thought I might post this here in case anyone has had problems with the iOS 11 Beta or if this carries through to the iOS 11 release.

As of Beta 4, my GW500S BT kept resetting itself every minute or so and I traced the problem to its trying to pull in my iPhone 6's phone book. When I disabled that in the GW500S's settings, it worked fine (minus the lack of a phone book import!).

In case this applies to anyone... good luck!