cmem issue after create/destroy several gstreamer pipeline

Hello I have an issue with cmem when I create and destroy a pipeline several time.

When EOF is received I destroy the pipe

    gst_element_set_state(pipeline, GST_STATE_NULL);
    gst_object_unref(GST_OBJECT (pipeline));

    g_main_loop_unref(loop);

and create a new one.

But after several time I have:

CMEMK Error: Failed to find a pool which fits 99840
CMEM Error: getPool: Failed to get a pool fitting a size 99840
Failed to allocate memory.
Error: encode thread failed to create circbuf or display buffer handles

It seems that previous pools are not unref.

what's the best approach to "release" all the pools before start a new pipeline?

Thanks in advance

Claudio