If your setup is connected wireless with your router, please try a connect with a LAN cable. Maybe you have only a bad Connection to your router.
If it does not help, please send me some more informations about your setup:
Which soundcard is on the Raspberry Pi (if you use one)?
Have you connected some USB devices? E.g. a wifi dongle? Often there is a problem, that the device have not enough energy if there are plugged several usb devices.