Correlations
Evidence linking system behaviour and releases to experience change - stated as association, not proof.
Strong correlation detected
Navigation abandonment increased 18% after v4.8.2.
Supporting signals
- Route API latency ↑34%
- Timeout frequency ↑4.7×
- Retry behaviour ↑22%
- Change begins within 2h of OTA rollout
- Concentrated on v4.8.2 vehicles
Potential contributor identified
Media playback interruption tracks Media Service restart behaviour on v4.8.2.
Supporting signals
- Restart rate ↑3.2×
- 14,218 playback interruptions
- 62% of restarts within 90 s of source switch
- Absent on v4.7.9 vehicles
Associated signal
Voice retry behaviour is associated with cold-start recognition timeouts.
Supporting signals
- Retry rate ↑2.1×
- Cold-start correlation 0.71
- Median recognition latency 912 ms
Method note
Correlation strength is computed across journey outcomes, system event frequency and release cohorts for the selected period. UCIVART states association and evidence volume; root cause remains an engineering determination.
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