"Jammer" Bug

Has you ever found that suddenly you can't lock on to targets properly after drag-attacking excessively with Grimlock? I think the 'touchmap' gets misaligned then and restarting the app is the only way to fix it. This happened to me several times, and I'm wondering if any other Android and IOS players had their Grimlocks or any other characters "jammed".~"Jammit!"