Yes, this is a problem because, as stated in the documentation, it can damage the Profilux and/or the Lightbar(s). It is essential to interrupt the power supply before connecting/disconnecting the Mitras communication cables.

https://www.aquariumcomputer.com/dow...ar-2-manual-2/

mlb power.png

Please open a support ticket: https://www.aquariumcomputer.com/sup...ets-enquiries/

Gaël