Only root note occasionally played when activating chord

Mac mini M4 Pro
Sequoia 15.4
Scaler 3 v1.0.2.b657b0d Standalone
Launchkey 39 Mk.4

When playing a chord from the dedicated keys on the Launchkey, occasionally only the tonic sounds; I have to restrke the key to hear the whole chord. This happens on the third or fourth chord in the sequence.