Have been practicing ILS - Autopilot approaches.
Works perfectly at most airfields. My technique is to intercept the ILS at 12 NMi and 3,600 feet AGL, couple the autopilot, control speed, break off at 50 feet on the radar altimeter, slight flare and land. Great system for night / bad weather recoveries.
At some airfields, the system goes breaks at about 500 feet AGL, the controls are sloppy and aircraft attitude changes without control input. First three landing were controlled crashes. Recovery is to apply full power, clean up and go around for a manual landing.
Tested airfields for repeatable failure are : Sochi-Adler RWY 06, Tblisi RWY 13, Mineral'nye Vody RWY 30. The loss of control seems to be consistently at about 500 feet AGL on the radar altimeter.