If you are seeing "AHRS OFFLINE" then you haven't received data from the AHRS in more then 3 seconds. You might try turning off synthetic vision ([SET] -> [EFIS] -> then toggle [SVN]) during these operations to ensure the OS:1 CPU isn't being overloaded and causing the lag. If not then there might be a physical connection issue. Do you have the gold magnetometers or the red AHRS boxes?