It may be that when the flowers were larger there were fewer of them in relation to plant size, thus more energy to produce a larger bloom. Your shrub may need to be pruned and fertilized to encourage more vigor. Being in a larger container will also help as the roots have likely filled the container and thus a lack of soil volume is limiting growth and vigor. Finally make sure the rose is in full sun. It takes a lot of sun to keep roses happy and at their productive best.
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