Can't find my remote (finder button not working)

I have a Roamio Plus, and the "find my remote" button only works sporadically. Typically, it'll work if I've used the remote in the past few minutes, but not if I haven't, which is sort of useless: if I've used the remote recently, I know where it is.



Does anyone have a suggestion on how to get my Roamio to always wake up the remote and make it sing?



Thanks.



---matt