According to airline tracking websites, the flight dropped about 1,800 metres (6,000 feet) when it flew into the rough air.
That's a controlled descent in response to the turbulence. A rate of ~2000ft/min as reported is perfectly normal.
Yep, also happens after the change in heading to divert to BKK. There is a strange blip before then, at about 07:50.
@Brun started
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According to airline tracking websites, the flight dropped about 1,800 metres (6,000 feet) when it flew into the rough air.