Don't concern yourself with it. If it bothers you at all, then just leave the Wi-Fi connected even when you put the device in sleep mode. It'll connect as the rep said & then it'll go back to normal. I've had your exact scenario happen. It's not a big deal. You'll get the ads & the offers back then turn off the Wi-Fi. It just needs to 'call home' and then all is well.
Leave the Wi-Fi on for half an hour to an hour or so then you should be good.
