ATEM Extreme - What does blinking "ON AIR" button indicate?

I've been streaming from this unit to a Peertube server on the local network for several months (weekly streams). It's been largely solid until a couple weeks ago when the button would blink and I would get some drop outs on the stream. I'm trying to troubleshoot the issue but support can't tell me what the blinking is supposed to indicate.
Anyone know?
(The troubleshooting options seem to be quite limited for ATEM streaming. I'm very tempted to use OBS or some other software on a separate computer for the stream rather than the built-in capability.)
Anyone know?
(The troubleshooting options seem to be quite limited for ATEM streaming. I'm very tempted to use OBS or some other software on a separate computer for the stream rather than the built-in capability.)