Totally normal. I have a few hobbies that go through cycles. I've even had breaks in these hobbies that lasted a few years. Perfectly normal. I think its a sign of a healthy mind. Go take up another hobby or revisit an old one. Examine your priorities in life. It is mentally invigorating!
Keep the pins tough as I'm sure you'll come back with a fresh and renewed interest in the hobby. You'll rediscover the joy in pinball.