How to prevent characters from repeating when entering text with a Bluetooth keyboard?
Based on what I've read so far, this may be a bluetooth issue.

Some people have fixed the issue by:


using only 1 BT device. If you have connected both a BT keyboard and BT mouse, disable one of them.
disabling Wi-Fi. Having both Wi-Fi and BT seems to trigger a repeating key issue.
using External Keyboard Helper Pro. It has a do not repeat option. Link to app.


At the end of the thread, it mentions that BT was re-engineered in Android 4.2. So if you upgrade to 4.2, that should fix the issues you are having.