GKTurnBasedMatchViewController not bringing up Messages Invite. Works sometimes, fails often

I am working on the turned-based match app Wordiamo. It is networked through Game Center. I am having a problem inviting new players through the GKTurnBasedMatchmakerViewController. I deploy it with:

let request = GKMatchRequest()

request.minPlayers = 2

request.maxPlayers = 2

let mmvc = GKTurnBasedMatchmakerViewController(matchRequest: request)

mmvc.turnBasedMatchmakerDelegate = self

mmvc.showExistingMatches = false

self.delegate = delegate

self.presentingViewController.present(mmvc, animated: true, completion: block)

After launching the view controller, when I press Invite Friends, sometimes it works fine (maybe 30-50% of the time), bringing up a Messages invitation. But many other times it returns the following error:

Error Domain=ExtensionErrorDomain Code=-5900 "(null)": The operation couldn’t be completed. (ExtensionErrorDomain error -5900.)

2017-11-13 17:53:10.616581-0800 Wordiamo[7733:1484145] viewServiceDidTerminateWithError:: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "(null)" UserInfo={Message=Service Connection Interrupted}

Any thoughts as what could be causing this failure that only happens some of the time? Thanks.