Crashes on Galaxy Tab 7.0 Plus

My app has not too many crashes fortunately, but I noticed something weird: more than half of the crashes happened on the Galaxy Tab 7.0 Plus, (GT-P6200) and (Gt-p6210). If I look closer, it appears that they are all running Android 3.2. And the cause is: java.lang.ClassNotFoundException: android.view.GridLayout in loader dalvik.system.PathClassLoader. So apparently Android 3.2 cannot handle a gridlayout I made.
But is this a thing of Galaxy Tabs, which were never updated to a newer android version, or is this 3.2 thing. I made the app on SDK 13, which should run on Android 3.2.
For now, I excluded the Galaxy Tab 7.0 from the devices list. Or should I upgrade the minimum Android version to 4.0?
Any opinions?