I can't figure out why my iPhone keeps disconnecting from my car ...

Lately when I am listening to music on my iPhone 11 Pro through my car stereo (via Bluetooth) and I ask Siri a question, (sometimes) my music will quit playing through via Bluetooth and will start playing on the built in speaker on my iPhone. When I look at my car stereo it says that it is still connected to my iphone (even though it is only playing through the iphone speaker) so I disconnect it from car and have to reconnect it. Then....eventually...it will start playing through my car stereo again when it finally reconnects. Has anyone else had this problem?