Glitches

Glitches, also known as bugs, are errors or disabilities in the code of a player. Glitches can be a disability in a player from creation, can occur partway through life, or can be sparked by events such as failed uninstallation attempts.

Trivia
Glitches were originally a barrier run into by the Real-Life MMO team, but they decided to leave them in as they were too much trouble to weed out.