iPhone XR

Hi guys and gals. I have been having this problem for a few months. Just putting up with it. I carry it in my front left pocket. I have a code to punch in to unlock it. But this last while the music channel would randomly start playing music. So we deleted it. Then recently it started opening all kinds of tabs. All this is happening without me unlocking it. I took it to my provider. They figured Siri was unlocking it. Turned her off also. Still doing this crazy stuff. Any ideas guys and gals? Thanks. Kim