Check your component placement to ensure electrically noisy components are placed away from eletrically sensitive components.
See also Section 9.2, “Component placement” for more info.
Check your wire routing to ensure wires to/from eletrically noisy components are placed away from wires to/from eletrically sensitive components. See section 11.3 Wire routing for more info.
See also Section 9.3, “Wire routing” for more info.
Replace the receiver crystal if it has been in a crash. Receiver crystals are fragile devices which can be easily damaged.
Check for bad bearings. Bad bearings will generate electrical interference. See section 30.8.9 Ball bearings for more info.
See also Section 28.13.9, “Ball bearings” for more info.
Connect a wire from the metal or CF tail boom to the battery negative lead. The tail belt can generate static electricity as it slaps the inside of the tail boom.
Connect a wire from the metal frame to the negative battery lead. The frame can generate an electrical charge in some cases.
Wrap the ESC receiver wire through a ferrite ring several times to reduce ESC interference.
Try wrapping the receiver in aluminum foil temporarily. If the glitching stops, then the receiver is too close to an electrically noisy component.
If using a brushed motor, check the brushes and commutator. Worn brushes and/or a dirty commutator can increase electrical noise generated by the motor.
Check servos. A buzzing or twitching servo can generate electrical noise on the 5v power supply and cause ESC or gyro glitches.