HP Prime Keyboard

[codycbradio]

Hello,
I've bought two HP Prime graphing calculators and both have had issues with the keyboard. The keyboard itself works, but random keys on the keyboard would at some point after much use would stop returning to the rest position. They sorta act like sticky keys, but once you let go, they don't jump back up; although, they also don't continue typing letters when you let go of the keyboard. Anybody here knows what's going on?