MSC not firing... Sleepy on a cold winter morning?

MSC issues. Have used MSC many times to trigger eos  from QLAB with no issues that aren't either obviously physical, operator or setup related.

This morning however...

The show's been running fine for past few days, with no changes since last night. However some MIDI cues aren't firing, seemingly on first MIDI trigger after a gap of around 15 minutes. Looking at Tab 99, the desk is receiving RAW MIDI from QLAB, but it looks like the beginning of  the message is partly missing and partly corrupted...

Any thoughts?

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