After upgrading iOS Devices to latest iOS 4.3.1 firmware many users reported that some bugs were occurring in the iOS keyboard and as we have mentioned before that iPhone 4 facing heat issue after updating firmware to iOS 4.3.1 but still not solid words out from Apple on that issue. But on iOS Keyboard, today a developer release a tweak which fixes the all bugs which occurs while using the iOS keyboard.
Keyboard Fixer iOS 4.3+, is a tweak which fix all the errors of iOS keyboard on iOS 4.3.1. This tweak does not create any icon on Springboard and has no special settings to adjust. The tweak is available in Cydia under BigBoss repository.