I've been having major notification issues for the last week or two and was hoping the update this morning would fix things, but so far no difference. iMessage is instant, some apps like WhatsApp have delays of several minutes to several hours, some apps like Facebook, Outlook, Snapchat I'm not getting anything at all (I don't use Snap much and saw I had multiple things from 3-7 days ago I never knew about). It's driving me mad.