I've had issues with bluetooth devices since 18.1.1. I first saw it on my iPhone 13 Pro Max, just after installing 18.1.1. I've had connection issue with everything between my Ford SYNC stereo to my Beats Fit Pros. Then a couple of weeks ago, I upgraded my phone to 16 Pro Max, which is now on ios 18.2. I'm still having frequent issues with bluetooth connections.
Often times, it will show that the device is connected, but it will not let me switch audio to it. Other times when I try to connect from Settings > Bluetooth it just spins and then says it was not able to connect.
Normally, the only thing I can do is restart my phone to clear everything. Although, last night, I was able to turn off bluetooth on the phone for several minutes, and once I turned it back on, I was able to connect to my Beats Fit Pros again. So, that makes me wonder if simply turning off BT and turning it right back on doesn't give it enough time. You have to actually turn it off for a longer period.
In any case, this bluetooth fiasco has been incredibly annoying.