Bluetooth not connecting

[Bluetooth connection issue]

Radio does not recognize my iPhone consistently. At times it will connect then immediately disconnects for no apparent reason. 

[Zrouge1]

On occasion mine fails to see my contacts, the phone is connected but when I try to make a call my contacts are not there, both by voice command and in favorites.  When I make the call from phone it goes right to Bluetooth, but only the contacts phone number is displayed, not the contact.  The other thing I get occasionally is it won’t recognize my voice commands to call a contact, but the favorites works fine.  I would say 75% of the time it works fine, and it could just be learning or some outside noise is interfering.