If you're one of the many with stuttering connection drops every minute or so,
It has nothing to do with dualshock,
It's not even due to using 2.4th
In the dropdown android notification settings. Turn off location.
That's it, that's what's stopping it working.
Why? Because location by default is set to use GPS and wifi and every few minutes will send out a ping. When it does this, it will send it via wifi and as the Xperia are not dual band for wifi it will interrupt or even worse disconnect your ps4 connection.