Ignition coil issue

Hi,

I am flying gyroplane with 915 iS. After around 20-30 hours I started to have ignition coil failures on both 1-2 and 3-4 cylinders. Apart from that, everything else looks fine.

What is very indicative is, that that happens always (100 %) when engine is idling during taxi, or in final approach just before touch down. (when engine is also idling but engine rpm slightly higher). Once I cycle Lane A switch, light goes off

Engine works perfect and no issues at all while cruising for 2-3 hours.

Voltage is stable showing 13.8 V or 13.9 V

I checked all spark plugs and they are with correct color  of combustion. Also, all connection looks good.

Any thoughts?

Is it a failed coil and if so, why only at low  engine RPM?

Thanks

Dejan