I don't think I'm having that exact issue, but I have noticed I am not always getting notifications when things are updated. I noticed this one day when something I follow was updated, but did not show up later that evening. And when I went to the page I saw it had also updated a few days ago and I never recieved the notification. I checked and re-checked the "subscribe" button, but I think it's happening on multiple things.
Put a hashtag everytime you put a manga to "I want to read" so it won't disappear, logging off of being inactive for couple of days is normal just re-log in again, I mean it happens often for me so it's normal for me. In order for your reading list not to disappear always put a hashtag on them, most likely your reading list won't came back cuz of the system so I suggest just put a hashtag on them

So I lost all my reading lists without ratings during the big crash. Which sucks but it’s fine, so I’ve been slowly adding items back onto that list so I can get update notifications since it looks like the official consensus is everything is gone for good. Has anyone noticed that the new items you add to now reading have randomly been removed a few works at a time? I started noticing this a few days ago when the system kept logging me out. Anyone else experiencing this?