Switch, D2R.
I’m mainly circling around Travinkal, but around the beginning of D4’s S3, I’ve been forced to shut down.
It doesn’t happen during portals, which are said to be overloaded, but even when I’m walking around town, it forcefully closes.
You can play normally with other acts, such as Baalran at 5. There are only 3.
If you go through 3, it will drop even at 5.