Ya, I noticed putting too much effort into it can sometimes actually hinder it since it's almost as if you've built up a huge framework of knowledge on the subject and your brain is becoming "bored" with the subject. I'd take ninja's advice, but you could also try switching things up so subconsciously LDs, RCs, etc. come into your mind. I'm not sure what method you're using (I'm guessing DILD?) but you could also try switching up and doing new RCs, reading information on techniques and things you haven't done or didn't know before on LDs, and switching up your techniques.