I just wanted to pop in and say that since the last patch I too have been having these problems. Before the patch, no issues. Now randomly in PoTD or in the new Expert Roulette I will start lagging terribly. Sometimes it'll clear up and I can progress or I will get disconnected. It happens only once a day. My fiancé and I both play on the ps4, he is also experiencing it. We use ethernet. Hopefully we can figure out what's up here...