A:Answer The Bluetooth in your home does have a limited frequency. As you stated, the more Bluetooth devices you have running simultaneously, the faster you use up the Bluetooth available to you and your home.
We have experienced the same thing but we didn’t until after we purchased the rear speakers that attach to our sound bar via Bluetooth. We have one of the Amazon Alexa, three Amazon dots, Bluetooth speakers on my computer, both cell phones connected to the Internet in our home via Bluetooth, etc. etc. etc.
With all of our many Bluetooth devices it seems that we to have reached the point where we have no Bluetooth to spare.
This is in the technical and scientific answer, but I hope it helps. Best of luck to you!