Lisa posted a response on the twit website

http://twit.tv/2015/05/27/evolution-twit-live

Part of this is the TWiT chat room, which offers direct access to our hosts and guests. Our volunteer moderators have always been diligent in keeping the chat on topic and not letting a few troublemakers derail the discussion. But it's gotten to where moderating the chat and people's frustrations with that have become a distraction. There has to be a better way, and we are working on a new chat solution to maintain a high level of interaction with our audience. We'll have more details on this soon.

The other part is our live stream, where you can watch us record our shows. With the number of shows on our network--now more than 20--adhering to a set schedule sometimes constrains our ability to produce live content. This doesn't mean that the live stream is going away, but we are going to mix up the format and offer both live and pre-recorded shows to minimize downtime. To this end, we may modify our broadcast schedule.