Rotax 912i Lane A /B light

Lane A/B fail For several months, I've had the Lane A or B light intermittently coming on when reducing power (eg final)

(Aircraft: CTLSi with Rotax 912i)

The message associated with the Dynon is for Lane A: ignition coil 2 and for Lane B: ignition coil 4.
Several ECU logs via BUDS have been performed, and I've done the following: Checked the high and low voltage harness. Changed coils 2 and 4

Changed the spark plugs

Changed the spark plug caps

But the same problem still appears after about 10 hours of flight.

The engine runs well.

Can you help me?