Its Not Robust Enough

The funny thing about being in office with two other people is you get to hear their phone conversations.  Well, earlier today, a disgruntled customer at one of our school districts called in to say their Internet service wasn't robust enough.  Now, I have heard the term robust to describe many things, but never Internet Connectivity.  I mean pasta sauce, yes, but not in how long it takes me to get to Google.   In either case, this infuriated a co-worker, who was hoping to hear a more technical term.