It seems to happen to a particular customer once or twice, or in the case of once customer, a half dozen times in a month. Then it seems to just go away.

But then it happens to some other customer.

Hard to track, very transient, no pattern.

We've been a reseller going on 4 years, and have only starting seeing this in the past 2 or 3 months.

We go through a pretty high volume of minutes per month, so we tend to uncover issues that individual customers may never run into.