Three seconds before loss of Autopilot, the aircraft is climbing at 1000 fpm with her NOSE DOWN four degrees off cruise. five seconds later, the NOSE is passing through 0 degrees and rising.
1000fpm UP and NOSE DOWN is a/p logic for UPDRAFT. If the UPDRAFT disappears, the NOSE will start to rise to lose the indicated and (actual) speed increase. These airspeed anomalies are more than sufficient to waste the ADR's in the eyes of the FC.......
The STALL WARN has a demonstrable failure mode, that we didn't know about.
You are a fair man, and very fluent in systems, DOZE. Do you care to address this possibility of OVERSPEED sans WARN?
The only conclusion I cannot accept as exculpatory is lack of WARN.
Further, these reads and prompts would not be accurate, but sufficient to cause degrade, PF takeover, etc.
It also explains perfectly the ensuing climb, since "crazy speed" cannot be dismissed, especially as an indicated speed.
Sir?