same with me, I installed iOS 14 beta on my iPhone 11 Pro Max and after that it just started kicking me out of apps and randomly disconnecting bluetooth. My AirPods 2 and the Pros. I then downloaded iOS 14 and now 14.0.1 and offloaded the beta. But nothing helped. It’s really getting frustrating, especially when your on a phone call. I hope this gets resolved asap.