When I first thought about writing, in my 20s, I could touch type quite fast and reckoned typing 1000 words in an hour was achievable. Then work a 9-5 day, with a hour off for lunch, and another hour for breaks in the morning and afternoon. That was 6 hours = 6,000 words per day. 5 days a week = 30,000 words. There! A 90,000 word novel in 3 weeks flat. What was wrong with that?
Nothing, except it didn't work.
Writers are not machines and there is more to writing than just typing words on a page. I have a lazy streak and sometimes I have to make myself write (I always enjoy it once I get going, just getting going can be a trial at times). Other times, the well of creativity has run dry. When my father died, I didn't write for three months, but I've had other fallow patches - usually after a big burst of creativity.
You have to judge for yourself if you're being lazy, or just need a bit of creative down time. Even machines need fuel to run.