If I understand you correctly, the circuit supplier has a 24 hour monitor and sees no slips, correct?

I assume you have rebooted the system? It can be some tiny little glitch you don't see. I repeatedly tried to log into my bank account this morning and the data kept going blank. After a lot of telephone support the lady asked me to close my browser and reopen it. I couldn't see what that would do but as soon as I reopened the browser I got in on the first try.

The CIX is essentially a computer and any little glitch that does not seem obvious can occur. I put all my installs on a one millionth of a second surge protector. Most surge protectors will act too slow to keep a glitch from occurring.

THE Bracha, old blond specialist in Rube Goldberg solutions.