system
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This has been an issue on and off as far back as Avast 5. They seem to eventually fix it for about 90% of people but still it lingers. Even with latest AIS version I have issues from time to time with it spiking.
Even worse… when it causes ping to spike in online games after 20 minutes of play time. But I’ve noticed it even in games audio will stutter at times with shields enabled.