@Steve-
After checking the basics, ie; fresh batteries, re-pairing etc if your Sky Q remote is definitely broken/faulty, if you follow this link it should allow you to do some more troubleshooting and then it’ll send you to a form to request a replacement (there is the possibility this is not available to customers in the ROI).
https://www.sky.com/help/articles/lost-stolen-damaged-sky-q-equipment#get-in-touch
It may be quicker to purchase a new remote from a retailer / larger supermarket. If you do that as well as the above you’ll have a spare.
In the meantime if you have an Apple device with Sky Go you can possibly set up a virtual remote to control your Sky Q box. See this link which may help
https://helpforum.sky.com/t5/Sky-TV/Virtual-Sky-Q-Remote-Now-Available-on-Sky-Go/ba-p/4363637?
▪️ I AM NOT A SKY EMPLOYEE (undercover or otherwise) ▪️
Sky customer since 2001
with: Sky Q | Sky Superfast Broadband | Sky Talk | Sky Mobile
NOTE: I only provide help on the forums and NOT via PM
