Is it normal: sudden change of habit

I masturbate.

Everyone does, it's an established fact. There are very few people who don't. Through previous research, I've discovered that it's also normal for it to be fairly regular basis. But that's not the issue here.

Occasionally I would just get an inclination, get onto the computer and utilize the internet for what it does best. There would be no prompt, no distinct urge, just whenever. Until approximately four weeks ago. It was following that commonly-occurring schedule, and it just stopped.

No major events in my life, no epiphany of philosophy, it just stopped dead for no readily apparent reason. There are lots of resources and sources of information for those who can't stop, but I found nothing about being unwilling to start. I'm not saying this is a bad thing, but it's a very prominent thing, and I feel that it may be an indicator of something big, whether good or bad.

Anyone else heard of this, or a cause or result of it?