When I say "fansubbing groups", this does include Licca Fansubs. We try to release on a consistent schedule, but we often do not. This post is not meant to criticize any group; it just illustrates a point that most people are not really aware of.
Many people who talk to members of fansubbing groups ask when a certain episode of a certain series is released. Often the response is "when we get to it", or some other vague and useless response. To explain why, I will use a hypothetical situation.
Imagine that you are an employee of a company. You are the project leader for some really important product, and you have 10 people working under you. The market conditions and research say that you need to create a product once every so many days. You are, of course, given all the tools and equipment needed to accomplish this.
However, the policies of the company, and by extension the people working under you, are rather strange. You may ask your people working under you for a 40 hour week, but HR and company policy say they can work any number of hours per week. They may work anywhere from 0 hours to working all the time without sleeping or resting. They may take as long of a vacation between working days and not lose their job. The people working for you are not paid, or if they're paid, they aren't paid very much. If your people show up at the office, they may spend an hour doing actual work, and 7 hours watching movies on cable TV. Your people may just conduct other "personal business" while they're in the office. You cannot fire them (regulations), dock them in pay (they're not being paid and they have a much better paying job elsewhere), or use physical force to make them work.
As the project leader... how do you manage your team of people, as described above, and keep a consistent schedule? The answer is you cannot. You are at the whim of your team.
What I just illustrated is your typical team of subbers in a fansubbing group. It is literally a project management nightmare.