I would also prefer to hear from the horses mouth I have a email into my account manager, hopefully that will shed some light.
I don't think I'm overly IT centric, I ran a number of businesses and operated in multiple roles, but I've seen a lot of system problems and bugs over the years and this to me looks like an overload, maybe an excessive amount of users or potentially a DDoS attack.
As you say IG can increase margin requirements in a response to volatility, they don't need to play bogus system error games, in my view, as downtime is extremely damaging to their reputation.