I have a problem with all Bluetooth devices freezing for 5-30 seconds. I went through all the Sony tech support steps of restoring the system, etc. to no avail. Sony sent out a technician with new Bluetooth hardware, which did not solve the problem.
I've discovered that the Bluetooth problem goes away when I have Wi-Fi turned off. Presumably this is a driver problem, or maybe the order in which the drivers are loaded.
When checking the device manager, there are no problems shown -- no interrupt or other conflicts.