I have had that happen to me a few times did notice I had some applications that were running in the background and might have been updating information. Like weatherbug that sort of thing it does not happen often does it do it all the time? Also in the options under screen keyboard you can change the type speed and hover speed. Change your key rate to fast tap interval to 100 and hover period to 100 try that see if it helps.
Also, the Storm tends to get sluggish after running for a while and the battery-pop hard reboot tends to speed things up for a while. There is another thread on this forum advocating doing this reboot every four days.
Occam's Razor nearly always applies when troubleshooting technology issues!
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