Random Voice Drop for the day

Hi,

Yesterday I experienced a very strange phenomenon regarding PhotonVoice with a Unity Build, using PhotonUnityNetworking and PhotonVoice for Oculus quest and Oculus Rift.

For this project we have 4 VR sets, 2 in Asia and 2 in Europe. Until now we have been able to communicate seamlessly unless there is a congested network, where some crackling appears for the voice of the user with the congested network.

Last Monday (27.07.2020) we run a test using one build and everything worked fine. Yesterday (30.07.2020) we used the same .exe to run another test and the voice suddenly did not work, both sets in Asia could speak and hear each other. Both sets in Europe could hear the VR Sets in Asia, but they could not hear each other and also, the sets in Asia could not hear the sets in Europe.

We tried another demo built on the spot and it did also not work and the 2 VR sets in Europe were connected to 3 different PCs to discard output device malfunctions.
We could not find anything on Unity's log files either.
After considering and discarding Driver Updates, Windows Updates, Oculus updates I went home for the day.

Today both demos work as expected.

Could it be that the european server dropped around noon (GMT +01:00) time?

I am just trying to understand what happened.
Thanks and best regards