Yup, there are several threads here on the issues with Iphone XS\XS Max. Rest assured Arlo is working on the issues.
If You Got Em....I'll Chew Em!
Netgear & Arlo Beta Tester
How did you fix it? Same problem. My iPhone 7 worked great with my Arlo pro 2 set up. This iPhone X’s max freezes and shuts down every time I try to look at live video. And everything else is extremely slow.