if your computer has a wireless connection disconnect it.
go to device manager,select your network wireless driver.
right click and choose DISABLE
this is totaly reversable,just right click it again and choose ENABLE.
wireless cards are big killers when it comes to picking up interference.
wireless intereference signals.
if this isnt the case and it doesnt cure your cold.
then retrace your steps and use logic,was it something i did by going to 24 bit,when did this happen,what did i change?
more importantly,what could sonar have changed to use as a defualt ?
its all common bro.