Mmmm ...
The company for whom I work (?) have 2 412EPs with AHRS and the 3 axis kit.
Nobody has reported anything like this on those machines in the past 8 years.
With the other 10+ (common or garden variety 412EPs) only one has reported anything like this occurrence and that was whilst carrying out an underslung operation (with both APs engaged) .... P1 still has the stains in his uniform pants, P2 reported (eyeballs uncaged rapidly) ...cause was put down to "collective bounce" don't know what engineering came up with ...
The noble quest (for information) continues ....
Good Luck