@Anonymous The Roku model you have was released in 2013. You can buy a new Roku Streaming Stick 4K for $40. It’s dual band in far superior to what you have now
If you think you may have spilled some liquid on it, or in my case, a small child was gnawing on it and saliva got into the inside, Take out the batteries, pop it open and dry the plastic sheet as well as the circuit board with a paper towel. Put it back together and you're good.