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Here is Blancolirio's report on Flight 1722 [1] He covers most flight incidents. His theory is switching to auto-pilot with it dialed into a low altitude and

• diebeforei485 4y ago
  I like blancolirio's channel but his theory about what happened is probably incorrect even though I think he chose the right analogy. His information about the previous 777 incident from 2021 is incorrect. The crew in that case did set the correct altitude in the MCP, but the system was stuck in ALT HOLD mode. The crew was hand flying following the flight director, which was telling the crew basically not to climb, so they had a very slow rate of climb. Unlike in this case, they didn't have a descent. Boeing issued a special airworthiness information directive about this - https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID150686425720220517194224.0001 https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID15068... What happened in this case is somewhat different. They had a sudden descent. Perhaps in this case it was enabling the autopilot (= automatically following the flight director, stuck in ALT HOLD mode at airport altitude despite setting the MCP) that caused the descent.