QRFC jobs hangs the system

Hi,
We have a problem with QRFCs. We created 50 queues programmatically and run some job in each queue. If the job is run directly, it takes only 2-3 minutes to finish. But when this is scheduled in the queue, in the queue monitor (SMQ1) it shows the process is running. Most of the dialog workprocess gets used up and the system hangs. We can't even login to the system. The situation is the same even after 24hrs and no actual work is done.
I feel some problem with system settings. Looked in to some notes like 527481, but most of their suggestions regarding profile parameters are already the taken care.
In the system log (SM21) I can see lots of these errors 'No APPC block received'.
Please help..
Regards
Ajith Chandran

The change or inclusion of these parameters worked for us.
rdisp/wp_ca_blk_no = 2000
rdisp/max_comm_entries = 1000
rdisp/appc_ca_blk_no = 500
rdisp/max_arq = 1000
rdisp/tm_max_no = 1000
Regards

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