Motorola Triumph :: Keyboard Frequently Not Recognizing/displaying Touched Keys?

I frequently turn the Triumph sideways to use the larger keyboard (easier to press buttons). After the first few letters I press are displayed, I can hear the phone click to acknowledge that I pressed a key, but nothing is displayed on screen.Items of note:

-The audible click when a key is pressed but doesn't display is not the same sound as when a key is pressed and actually displays correctly on-screen.

-often, but not always, when the phone is turned upright, the missing key presses will appear after all as successfully typed in the display.This is my first smartphone. Is this a problem with the gyro-rotation logic? Is this a common problem with phones in general? Is it a symptom reated to scren protectors?

-I have not removed any screen protector meant to be permanent to the phone. I believe there was a bluish film meant to be removed (which I did - at least therewas definitely one over the camera lens)

-I did carefully apply a ZAGG Invisible Shield universal screen protector. NOTE: It was not quite as large as as the Triumph screen and thus the top edge of it lies slightly into the front-facing camera lens and the sensor on the upper right.