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Silicon Validation Intern
Write a real answer. It is graded against the question's stored rubric, the mastery movement is computed by the same engine the product uses, and — the part worth watching — the next question is chosen by the real scheduler from what you have already answered. Nothing is saved and no tokens are spent.
An I2C bus on a test fixture works for hours and then stops responding entirely until the board is power-cycled. SDA is stuck low. What is happening, and how would you both recover and prevent it?