This was happening through out the alert and I managed to capture some footage. As you can see he doesn't even appear as a dot on the map and I couldn't lock onto anything. Once we got to mantis I was able to see him but unable to see the nullifier. This was on PS3.
Has there been any progress on this? The only workaround I've had so far is to leave the instance and come back to force a reload.
Still having problem. Even with a SSD on PS3, rendering in League Halls (the Hall itself, the Alert, and the Raid), drops in and out. Relogging helps, but is inconvenient.