My adapter wouldn't authenticate with my AP as usual on resume from sleep. Instead of disabling and enabling the WiFi adapter to resolve the issue (the usual method,) I disabled UAPSD, and the adapter and AP authenticated like it would have by refreshing the adapter. This might be the solution. I will leave it disabled and try some sleeps and resumes!
For anyone following, you can disable UAPSD through Windows Control Panel > Device Manager > Right Click AC7260 adapter > Properties > Advanced Tab > UAPSD support > Value: Disabled > Ok.