Other than trying other wireless channels in your router on the corresponding 2.4ghz or 5ghz bands, and lowering the channel width/bandwidth, no real way to eliminate the interference that may be caused by the wi-fi direct of the remote.
You could perhaps try using one of the Roku streaming players (rather than the streaming stick), and then use an IR remote rather than the RF/wifi remotes, but I think with some network tweaking with both band selection and wireless channel selection, you can minimize the interference to a tolerable level.
You may need to consider if it is the Roku actually causing the interference, or is the Roku amplifying interference from another nearby device. May only occur when using the Roku device, but is actually being caused because the two devices are not playing nice with each other on the network. Sometimes takes a concerted effort to investigate and then place certain devices on certain bands (either 2.4 or 5ghz) and reserving an address in the router so they stay there and won't conflict with each other.
