Mine already set at 3, but prob persisted.
Later, after renaming the BtOfficeAddin.BtOfficeIntegration.1 folder as BtOfficeAddin.BtOfficeIntegration.1_old it's worked for me.
Hope you can also delete that folder as well.
The issue is caused by some kind of office add-in, and most probably is the Bluetooth add-in for MS Excel.
Thank you guys...