According to this, Matt will be out of the show indefinitely due to a medical emergency. Didn't see a thread on the topic yet.
There's been a few. Obviously details are vague, but it sounds like (according to their more recent patreon announcement) that Matt is communicative in some manner. Speculation is probably a stroke, as we saw with Fetterman recovery can take quite a while in that case.
The good news is Amber (Matt's wife) gave birth, both she and baby are doing well.