First try these network troubleshooting steps:
* Try connecting directly via an ethernet cable (rather than wirelessly), and see if it works better.
* Try rebooting your modem and router and restarting the Roku player.
If this doesn't help, then you can also contact Roku directly in regards to troubleshooting your specific device and settings:
Support Link: http://support.roku.com/home
Phone Support: 888-600-7658
Live Chat and Email: http://www.roku.com/support/contact