LOL. (I can feel the pain).
I’ve had a number of these, too many for sure but not enough to make me want to rage quit as I remember D2 and D3 laiunch and also WoW launch 'FUN".
Anyway as an example that is worse than you cite is the final battle that leads
toward Lilith encounter.
Got to make it past a couple bosses where you have to DO STUFF (spoiler avoidence)
I got disconnected at a point where you DO STUFF and the return run
required at solid 30 to 40 minutes the the DO STUFF bit.
LOL.
I can laugh now as I did manage to collect a lot of garbage to melt on the way.