iPhone 6S plus Vs. iPhone XS Max with MG2

the link below is my 3rd video documenting the audio issue with the iPhone XS Max. I chose another app to show it is not app specific. Both phones have the same iOS running the same app. The XS is unable to handle low buffer settings required for live audio performance. The older 6s Plus did not suffer from this problem. While the 6s doesn’t exhibit the cracking associated with small buffer, MG2 did crash a few times on me last night, may have overheated. I wouldn’t trust it on a gig. Anyone tested an iPhone 11 or iPad mini 5 gen?