It doesn't surprise me. They along with Netflix have pioneered the steaming movie business. The Roku 3 is a great product and works flawlessly and offers more channels that I even care to count. I have had one ever since they came out.
I agree the Roku is a great device but there are many complaints about the Roku 3. The flaw is in the controller which consistently loses connectivity with the Roku. Your Roku 3 may work flawlessly but read the support forums and you will see all the people who had issues with the Roku 3 controller (in most cases, the units were sent back to Roku under warranty).
Note - If you want a Roku, purchase an older refurb Roku 2 XS. The Roku 2 XS is considered the most reliable and it has the functionality of a Roku 3 except the audio jack in the controller.