To contrast, in my early days of options trading with Interactive Brokers, they had closed a spread ~10 minutes before expiry at a loss, which turned profitable 8 minutes later.
Contacted support, and they responded within 2 minutes explaining exactly why this had been done (risk profile at the time, and insufficient margin to cover). They answered all my questions and even explained what I should do to mitigate this issue going forward.
Used to have IB: that broker is no joke. I would see ads on TV of $7 a trade while I was paying their crazy .001 cents per share or whatever their price was. Great paper trading account, and a Java/C++ API for everything. Plus level-2 data.
Contacted support, and they responded within 2 minutes explaining exactly why this had been done (risk profile at the time, and insufficient margin to cover). They answered all my questions and even explained what I should do to mitigate this issue going forward.