I am using the new Google Play Game Services to develop my game on Android and I am now trying to include the invitation system.
Have have 3 Google+ accounts that I use to try the invitations with 2 Android devices and 1 Android emulator.

My problem is that the invitations are not always received when they are sent. Sometimes it works fast and perfectly, sometimes it won't work. Just cancelling the invitation and trying again can change the result.

Here a 3 tests I did just to make it clearer :

Test 1: Emulator was inviter, Nexus 4 didn't receive and Optimus One received

Test 2: Nexus 4 was inviter, Emulator received and Optimus One received

Test 3: Optimus One was inviter, Emulator received and Nexus 4 didn't receive

From those results we can see that my Nexus 4 received no invitation, but it worked several times before those tests.

Furthermore, sometimes I receive the invitation notification (on the status bar), but most of the time I don't receive it.

Did someone experienced the same abnormalities as I did?