Flashing Scuf Xbox light - controller won't work

Last night in the middle of a game my Scuf Instinct Pro turned itself off.

Although I hadn't seen a low battery warning, and I was pretty sure the rumble/vibration was still working up until it turned off, I assumed it was a batter issue and switched out the battery. Nope.

It no longer connects to the Xbox. All it does now (and I've tried multiple brand new batteries), is one of two things (they're pretty close);

  1. light up (the Xbox symbol) for about 5 seconds, and then do 3 slow flashes
  2. light up (the Xbox symbol) for about 5 seconds, and then do 2 slow flashes

If I hold down the connect button to sync w/my Xbox, nothing happens.

If I hold down the Xbox button, the controller turns off

Any suggestions, or is this Scuf controller dead?