Does R09 need shaking before mixing?

Seems like my R09 has crystals in it. Does this need to be shaken before mixing. Does something seperate out when it is sitting there for months?

I had very thin negatives the first time I used R09. Then I changed several things and my latest negatives are far better - they look normal. I changed the following:

1) I shook the R09 in the bottle before mixing.
2) I used 1:40 rather than 1:100
3) I changed the time to 8 min instead of 18 min

I know, too many changes to be an experiment. However, I wonder if anybody has found that R09 needed shaking before mixing. Or if that was something irrilevent in my changes.

Thanks.

I talk to mine. Reacts much better if you don't upset it. And use 1:20 , 1:40, 1:80 instead of the times quoted for Rodinal on the Digitaltruth place @ 1:25, 1:50, 1:100