As mentioned here: https://forum.electra.one/t/flashing-midi-ports-in-status-bar-and-crashes-freezes/2855/10
Roland equipment seems to send Active Sense messages every 300ms. This leads to the status bar flashing making one think that there is MIDI activity, but is is a “midi ping” message that is mostly ignored/not-sent by almost all manufactures.
I would like to request a top-level fitter (perhaps on the Configuration → Midi Routing page) that allows one to ignore Active Sense messages.
Each Roland device will send this every 300ms. If multiple devices are connected, they will each send this message, every 300ms.