We have the same issue of Netflix not connecting to roku device. Called Netflix and after spending an hour with the very patient technician. we went through the disconnect, reload, reboot several times with him to no avail. He said it was possibly our WiFi tower in our house, but all other channels, our phones, tablet and another smart tv in the house worked fine with Netflix. So, we went out and bought a new roku streaming stick 4k. Still no Netflix. We took the old roku and installed on the smart tv and the same issue through roku only….no Netflix. Netflix on the smart tv worked fine, just not through the roku stick. A definite issue with roku, not the tvs or the WiFi. No idea what’s going on.