I have been using the Bose Soundwear for a while now as a Bluetooth headset for my phone. The problem is that after a while, quite often, I find lots of dropouts and bad sound and appears to be a poor connection with the phone. It resembles how a distant radio signal can sound distorted and go silent. Many other people I talk to on the phone tell me they are having trouble hearing me as well.
I am quite confident that this is not an issue with the phone itself. I have experienced this using two different android phones. My current phone is a Pixel 3a XL.
I am never more than a couple of feet away from the phone, so it is not out of range.