we have had this problem for a few days where the picture and sound are not the same, what can be done to sync them? We have reset our wi-fi not sure what else to do.
First thing I'd try, especially if this is happening on multiple channels, is a restart of the Roku.
These things are just special purpose computers. Like their big brothers sometimes clearing things out by restarting them can correct problems.
Depending on your Roku model and Roku version number you'll find the System restart option under Settings > System > Power or if not there, under Settings > System. (Note that if yours is a Roku TV with "Fast start" enabled, turning it off and back on just puts it into and out of a standby state and does NOT give you a complete restart -- use the menu method instead.)
You can also restart by pulling the power plug to the Roku for a few seconds then plugging it back in.