Host becomes invisible all of a sudden (Quest1/2 VR)

Hello,
I am not sure yet whether this bug is a PUN bug or my game's side bug but I would like to shoot at every direction.

Issue:
Host character prefab suddenly disappears or becomes invisible. The other players in the same room as the host cannot see the host any longer but can hear the host's voice via Photon Voice so we know that the host is nearby.

The host can see the other players and can hear them just fine. It's as if there are no errors or bugs happening on the host side.

But on the client side (other players) they cannot see the host but can hear the host so I'm assuming that the host simply didn't get teleported somewhere else because the Photon Voice will follow the host's body while it move so if the host did get teleported, the other players won't be able to hear the host.

Any thoughts on what could've caused this? Thanks!