mic echo

I'm using an Avantree Bluetooth headset with a mic. A month ago my mic worked fine, but I started noticing a slight echo in everything I record, recently. It's quite subtle, it's not like a big booming echo. I've tried just about everything I can think of to try and fix it... I've tried...

Me and my friend both have a crazy echo problem on our mics. We can both hear each others games, music, everything and it gett