Multiplay is totaly broken.
I start woring when I´ve found it was at least 4 different studios around the word working with 343i for the remaster.
For me single play is fine most of the time, my only consern is that I´ve been unlocking the achieviments (they pop out) but the some are not being registered in Achieviments App.
Hope the next up date fix that issue and I don´t lose them - 1:50h to finish Silent Cartogapher on Legendary.