Hey there Zehraaaa93,
Oh no, that isn't good to hear! I can imagine this issue is pretty scary, so I'd be able to help resolve it! Now, I have to ask, have you tried changing the batteries recently? If not, please make sure to use store-bought AAA 1.5 V alkaline batteries. In the meantime, you can use your phone as a virtual remote while your current remote is out of commission.
I look forward to your response, and if you have any other questions or concerns for me, please let me know!
It's us again. How's it going? Did you manage to get your Chromecast Voice Remote working by following the steps provided by Jeran? If the issue persists, you may also try resetting your Chromecast with Google TV and Chromecast Voice Remote.
Thanks for the help here, Jeran.