Sony NW-A306 aptX and reconnecting issue

It seems like switching Bluetooth connection quality requires forgetting the device. If you switch connection quality to (e.g. aptX HD) and reconnect the device it can have issues while reconnecting when powered on. In my case, I had to go to Bluetooth settings every time headphones where turned on and manually pair them.

To change sound quality select

Settings 
  -> Connected devices 
     -> Connection preferences 
        -> Bluetooth 
           -> Wireless playback quality

and select whatever preferences you like (make sure to double check whether your headphones support selected codec).

In order to forget connected device select

Settings 
  -> Connected devices

choose settings for a given device

and make sure to forget it

Once I have forgotten the device at Sony NW-A306 and reconnected it from the scratch it works as expected. When I power on headphones they are connected with a player automatically.