Does anyone feel significant delay when switching to another device?. According to the manual, press/hold for 3 seconds to switch to another device, but it never works like that. I have to press/hold almost up to 10 sec to switch. The long press to switch between devices doesn't seem to be best way. I prefer just pressing FN+key to switch to another device like my another keyboard, drevo calibur, which almost instantly switches when pressing Fn+Q/W/E. Is this because this device uses Bluetooth 3.0? or did I get a defective one?