I've spoken of this before, but BS like this is happening every. Damn. Time.
Observe:

The person never came back... but, magically, as soon as I finished soloing the double linked boss, they wanted to start the next room.
It was so quick, it happened before I could even press conclude. And then, of course, I had to wait out the timer because they wouldn't conclude.
This is beyond absurd now and is moving into farce. Something has to be done about this if Kabam seriously wants us to continue randoms.