Beats Studio PRO - ANC crackling/ feedback sound

A sudden hissing sound when turning on Active Noise Cancellation (ANC) on nearly 3-year-old headphones typically points to a hardware issue, such as dust, earwax buildup, or moisture degrading the sensitive internal/external feedback microphones. Your beats might use hardware service

mykori wrote:

I don't think hardware suddenly fails.

it does, all electrical components have a lifespan it's a statistical number it's called mean time to failure,

it being statistical it's the reason behind warranty came to exist

what AI says:

"Mean Time to Failure (MTTF) is a reliability metric that predicts the expected operational lifespan of a non-repairable system or component before it permanently breaks down and must be replaced. It is widely used in engineering, manufacturing, and IT to plan preventive maintenance and manage spare parts inventory. [1, 2, 3]

Calculation and Formula

• Formula: \(\text{MTTF} = \frac{\text{Total Operating Hours}}{\text{Total Number of Failures}}\)
• 
  
• Example: If 100 sensors run for a combined total of 50,000 hours before 5 of them fail permanently, the MTTF is 10,000 hours.
• 
  
• Meaning: On average, an individual component will operate for 10,000 hours before its permanent failure. [1, 2, 3]

Key Differences from Related Metrics

• MTTF vs. MTBF: MTTF measures the average time to failure for items that are discarded and replaced (non-repairable like lightbulbs, hard drives, or resistors), whereas Mean Time Between Failures (MTBF) measures the time between failures for systems that are repaired and put back into service [0.6.1, 0.6.5, IBM]. [1, 2, 3, 4, 5]
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• MTTF vs. MTTR: MTTF tracks how long a part lasts, while Mean Time to Repair (MTTR) tracks how long it takes to fix or restore a degraded system

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more

mean time to failure - Google-

I was just commenting about that things need not external factors to die, not in particular about your case / headset.

you can try to contact hardware support and hear, not sure if they offer repair, but they might give you a new pair with a price reduction, can't hurt to try.

about fixing them yourself, then personally I never had much success with repair of heardsets (any type) myself but if you done stuff like it before.