Bigs are not used to switching. Fouss has been beat on a lot of these situations where they he is late.
Catchings hasn't adapted to this level of play. He guards a lot of perimeter guys and is playing them too tight. Give them space and use your length to contest.
Scheme issues. Guys not knowing when to switch and when not to. This will get much better.
With Demin, Keita, Saunders, Mag and others this team has too much defensive talent to not be good. I'm not worried.