Hey everyone,
Sorry I didn't update like I said I would, but I thought this thread would just get buried. Since people are commenting still, I guess I'll come back.
So, after my last post, I thought the error was gone. Nope. A couple days later, it happened again. It seems I was wrong about the network thing. Sorry about that.
Aag, your print will continue not because of my advice, but because you turned off the flow sensor. I also tried this. Please be careful and watch your print. The PVA material may stop extruding properly, and your printer will just print air.
This error only happens when I use PVA as support. If I use extruder 1 with build material support, it always works fine. I haven't found the exact source of the problem, but I have tried tweaking the feeder tension in both directions, and that hasn't changed anything.
I haven't printed anything requiring support recently, but if I find anything else, I'll update. Again, sorry about the misinformation.
Happy printing everyone!