bass freq cuts out BT headunit

[duece9s]

recently switched decks after using my pioneer for 12 years, and replaced it with a new pioneer unit. for easy of explanation i will say volume 40 is my 100% volume while using 100% phone volume. while on bluetooth listening to rock at volumes of around 30 my sub cuts out, sometimes even during the middle of kick drums, but i can see that the sub amp still has power. now only when i listen to all that remains (metal, heavy drum bass) on BT, the bass doesnt cut out even down at volume 15. using usb drive as source the bass doesnt cut out on any of the rock stuff as it does on BT, even at volumes of like 10. on my last deck i used aux cable 24/7 and never had problems.