I found one or two mentions of Speed Error but could not see any explanation of why this might occur.
On a recent flight I had a spurious obstacle warning which I put down to the sun on the front sensors. I was flying over a quarry at close on 200 feet in VLOS with no birds or other obstacles.
Later looking at the flight record I could see nothing unusual apart from one Obstacle Avoided. Revise Flight Rout message and 1 second later 2 Speed Error warnings.
I landed safely and have had several subsequent flights with no warnings.
Can anyone shed any light on this please?