I think its important to compare apples to apples..the Flex box is garbage and isn't anywhere near the level of Roku..that said, its important you state the exact model, firmware version, type of connectivity (wired/wireless) and how its connected (direct to TV, AVR, etc). As to connectivity, the leading issue with wireless is channel congestion. I have a suspicion you're using Xfinity gateway, aka modem/router combo and the channel selections are being done with the default 'auto' setting. This can be a major problem and the best way to alleviate it, is though installing WiFi Analyzer for Android or something similar for iPhone. When you open the app look at the channel graph. where you'll see how many others are using the same channel. Then you'll need to find out how to log into the gateway, disable the auto channel selection feature and select a channel with less congestion. The star icons on the app rate channel strength making it easy to choose one with less congestion