I have a couple of tablets for a school software.Tablets are mid 2.3 gingerbread. They work ok. When they start, it checks for wi-fi and automatically connects. My problem is, after 30 minutes of inactivity, when they get into stand-by, after I unlock the screen my wi-fi connection is not available. But if I turn off/on it works ok. I was wondering how can I fix this so that when the screen goes into stand-by when it wakes the wi-fi will work. (The tablets are in a different city and I can't turn the wi-fi on manually or by remote). Any help is welcomed. Thanks.