Chrome Version       : 65.0.3325.184

What steps will reproduce the problem?
I have a bluetooth controller that fails to start notifications every other time I attempt to connect it.  This issue only shows up on Chrome OS, I cannot reproduce it on my Mac.

In these logs I did the following:
1) Connect to controller
2) Disconnect from Controller
3) Attempt to connect to controller again.  At this point my connection flow fails when I try to start notifications.
4) Attempt to connect to controller again.  This time the connection is successful
5) Repeated 2-4 two more times.


My code for starting notifications is this, I've had to add the "stopNotifications" followed by a second delay, followed by "startNotifications" in order to work around other notification bugs I was having on Chrome OS.

```
return this._batteryCharacteristic.stopNotifications()
      .then(new Promise((resolve) => setTimeout(() => resolve(), 1000)))
      .then(() => this._batteryCharacteristic.startNotifications())
      .then(() => this._batteryCharacteristic.readValue())
      .then((event) => {
             this.emit('batteryLevelChange', new Uint8Array(event.buffer)[0])
      })
      .then(() => standardService.getCharacteristics())
```

the `startNotifications()` call is where I get "GATT operation failed for unknown reason." error.

 

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