Can't connect JBL Flip 3 and JBL Charge 3 properly

Can't connect JBL Flip 3 and JBL Charge 3 properly

Whenever I try to connect both of my speakers JBL Flip 3 and JBL Charge 3 to my iPhone 7 one of them the music keep cutting ( depends which one is the main speaker) The main speaker I'm connected to play music perfectly the other one keep disconnecting specially when I change the volume, change the songs, or even move the speaker. If I connect to only one of them alone without using the JBL connect feature the speaker works perfectly.