Catalina Mouse and Keyboard response issues

I purchased a new Mac Mini. The magic mouse and keyboard stop working if they are not used for more than about a minute. Sometimes I can get them working by shutting them off and turning them back on. Sometimes I have to restart the computer to get them to work. I had the same issue when I updated my Macbook Pro to Catalina and reloading the OS fixed it. I have tried this twice with the new Mac Mini and it did not help. I read a couple of articles which said to delete some files in the library/preferences folder of the computer but I searched for them and they are not in this computer. Any ideas on other things to try?