I have been noticing a cycle. After outages, the chat usually disappears and doesn't come back until the next day or even in 2 days. I don't know why this is happening but I do miss it as well, I have been chatting with some people and now I have no way to talk to them anymore about the subject we have been talking about previously. It'd be strange to start a whole new conversation and immediately jump to the subject we were discussing before. I hope this gets fixed soon.