GRT Avionics

We have a dual screen horizon HS, on which the attitude display has suddenly slowed right down. Air speed, variometer and magnetometer all work properly. Anyone know of a fix? I'd like to sort it quickly, but GRT all seem to be at sun'n'fun!

Tony Bishop, UK

Greg says he would need to see a recording of the data (DEMO file) to see exactly what's going on.