Maintenance :: Windows 8.1 Won't Retain Changes To Power Option Settings

I've been trying to change my power options. I go into Power Saver, "change plan settings," and try to change the "On battery" setting from "Put the computer to sleep: 3 minutes" to "Put the computer to sleep: Never." (I want to make this change because I have a Dell XPS, and it can have difficulties waking up from sleep.)

I've made this change a number of times, but after a while my computer simply reverts back to the 3 minute setting on its own. So, I leave the machine alone for a few minutes, I come back, and it's asleep...even though I thought I had changed the setting to 30 minutes. And in fact, I *had* changed the setting to 30 minutes; the computer is somehow reverting to 3 minutes on its own.