Wifi remote doesn't just work out of the box like a IR remote it has to be paired. Can wifi remote lose its pairing to roku, sure happens all the time. So re-pair it, unplug the roku from the power for a bit, plug it back in when the roku is bouncing start pressing and holding the pairing button in the battery compartment. When it stop bouncing lift off the pairing key for a bit and then start pressing again until you get conformation its paired. Use new batteries please.