Sometimes the screen stops responding for about 3 to 5 seconds when running an application that needs to use the stylus to click the screen repeatedly within a short time. For example, the windows built-in software like SMS, email, solitaire, etc.
Note: This hot fix can only be installed in ROM version less than 1.19.xxx.x. To check your ROM version, tap Start > Settings > System tab > Device Information to confirm the ROM version.
If you are a Touch HD user, download the hotfix from here