Hmm
usually you can not trigger the event onAfterRender multiple times without problems
but are you sure that you want to trigger onAfterRender ?
probably you want to trigger the 'onContentPrepare' event that also (can) exist inside system plugins
so try triggering the event 'onContentPrepare'
see an example here
flexicontent.org/documentation/faq/71-fi...maps-plugin-etc.html