OK, I just got the new Roku 1 today and it is having the exact SAME problem! Either this really is affected by my home network in some way, or the current firmware for this model is bad. Watched one thing on Netflix and it was rather subtle, then played something on Vudu for a few minutes and the picture glitched several times. I already bought a Roku Stick and it does NOT have this problem. However, I still need the Roku 1 for Netflix since it has the old interface that does not intrude on the movies; the one they have on the Roku Stick is unacceptable.
Hopefully someone can still look into this, I'll post the relevant info here:
Firmware version and build number: Version 6.2, Build 3473
Channel(s): Any that have HD video (including, but not limited to Netflix and Vudu)
Have you rebooted? (If not, try it): Yes
Have you deleted, rebooted, and re-added the channel? (If not, try it): Yes
Does the issue happen on other channels?: Yes
Can you upload a short video of the issue to YouTube or Dropbox (or similar service) so we can see what you're seeing?: Sorry, I don't have an adequate camera for that.
What is your Roku serial number?: 1XH524006997
Please include ISP: AT&T
router make/model: 2Wire, 3600HGV
connection type: Wifi (only method supported)
connection to the TV: HDMI
peripheral make/models that are between the Roku and the TV, etc.: Pioneer receiver, model VSX-23TXH.
Any other information that may be relevant but not included in this list: See above!