This is very similar to what happened to me. If I log out, not get dc’d, and try to switch characters I would get a black screen for part of the screen. I couldn’t port anywhere. I would DC after about 20 seconds or dc immediately when the loading screen got full. I was also in forbidden reach and on a shard completely by myself. Every rare was up at the same time, as was an elemental event, as were 3 rare chests. Around 10:30 central last night I was able to stay on for over an hour and do a m+ but haven’t checked today.