When joining a multiplayer game, from the friends list or the server list, it stays on the searching for multiplayer game screen for a while (2-10 minutes) before showing the unable to connect to world screen, when it does end up showing that screen. When you select cancel, it takes up to a minute to show that screen.
When creating/loading a multiplayer game, always says the message of "Oops, your Microsoft account got disconnected. Log back in by going to the main menu". 2 computers tested.
PC 1:
Intel Core 2 Duo E8400 3.00 ghz, 4 (2x2) gb DDR3 1333mhz, 250gb HDD, Intel Graphics Media Accelerator 4500 on Intel Q45/Q43 express chipset.
PC 2:
Intel Core 2 Pentium E5300 2.60 ghz, 6 (2x2+2x1) gb DDR2 800mhz, 400gb HDD, GTX 285 on Intel Q33 Express chipset.
CPU Usage on menu main menu/world select reported by gamebar at 100% usage, restart/reload fix no longer working.
Possible cause of issues: Low end CPU(s)