Glitches occur when the Lab Rats' bionics go out of control. Because they are human, their emotions can affect their powers. In Bionic Showdown, it was revealed that glitches occurred because bionic abilities were never meant to be integrated into the human nervous system. It can also cause half consciousness, fainting, severe bodily spasms, some of which seem to cause sonic vibrations, and a trance like sleep walking state in which bionic subjects become abnormally destructive with their powers. Their systems are also being damaged by glitches and the regenerative abilities of capsules are crucial for suppressing and repairing the subject from them.
Adam Davenport
When Adam gets extremely excited or happy, uncontrollable Plasma Grenades shoot out of his hands. Plasma Grenades were first seen in Crush, Chop and Burn when the gang convinced Davenport to let them stay at his house. They were then seen in Air Leo when he successfully went through with a cheer with Bree.
Adam's other glitch is Heat Vision. He is already known for this power, but when he gets angry, his Heat Vision is uncontrollable. Heat Vision is first seen in Crush, Chop and Burn, when Dooey Dingo annoys him and Adam shoots flames at him, catching his head on fire, and again in Robot Fight Club, when Caitlin angers him. In Hole In One, it is shown that Adam can accidentally shoot flames during a sneeze. His Heat Vision seems to have changed from fire to lasers.
Bree Davenport
When Bree becomes nervous, she will jump onto objects or super-speed away. (As revealed in Leo's Jam.)
Bree also looses control of her vocal manipulation when intimidated or nervous, causing her to randomly switch voices and replicate a variety of noises. (Bro Down)
When she first started attending Mission Creek High, she wasn't used to camera flashes, so her eyes would turn into a shiny shade of black (Trent Gets Schooled).
Chase Davenport
Chase has three known glitches so far: Commando App, Sonic Sneeze and uncontrollable Magnetism App
He goes into Commando Mode when he is extremely angry or feels threatened. During Commando Mode, Chase lashes out at the person/object that made him upset. (Commando App and Spike's Got Talent) When Chase enters Commando Mode, they call him Spike.
Another glitch is his sonic sneeze and it has enough power to put out a wall of fire (Crush, Chop and Burn Part II).
Also, at the end of The Jet-Wing, he had metal all over him.
Leo Dooley
Before Leo got his arm capsule in Under Siege, he sleepwalked. While sleepwalking, his bionics glitched and he kept firing laser sphere's.