Solving playback issues

[ledruide]

Our Ultra 4800X has been scrambling and/or throwing weird video artifacts on several channels including Max and Netflix. This was true on our previous Samsung TV and is also happening with our brand new Samsung. I bought a new HDMI cable in the hope that the cable was the problem. I have also done a factory reset on the Roku. First pic is from Max; second is from Netflix. Ideas?

[JWS9518]

Try unplugging your modem and router for 60 seconds and see if that helps.

[ledruide]

Thanks. The modem/router has been restarted many times since this problem first appeared; in fact the whole setup has been moved from one state to another and the problem is still there.

[JWS9518]

What brand/model of router? How old is it? Have you check for a firmware update?

[ledruide]

The modem is an Arris SVG2482AC. Firmware versioning is controlled by the cable provider. (I tried to post a link to the Arris support page on this subject, but the board won't let me.)

Anyway I am confident this isn't a modem problem. The Netflix app on the Samsung TV does not produce these artifacts and I can stream Max from a laptop with no problem -- all on the same network, using the same modem. I am 90% sure that the problem is the Roku itself.

[JWS9518]

Those combo modem/routers are not particularly the greatest.  If the router is capable, try setting up a guest network and connect the Roku to that.

[ledruide]

The Roku is hardwired to the router via an Ethernet-MOCA-Ethernet connection. The linespeed is more than adequate. (I can provide numbers if it matters.) What would a guest network accomplish?

[JWS9518]

Setting up a separate network can help with congestion with wireless devices, however, since you have this hardwired, it will most likely make no difference.