E2k10SP1 | Mails are backing up in MAPI Delivery queue - Restarting the transport service flushes the queue

Hello,
Need assistance on Transport issue.
Setup:
Windows 2008 R2
Exchange 2010 SP1. Three member DAG and two HUB & CAS combined role servers configured with Hardware load balancer.
Issue: Randomly some mails are getting stuck in MAPI delivery queue. Restarting Transport service for couple ot times, flushes the queues.
Troubleshooting done so far
1. Disabled  - TCP Chimney Offload, Receive Side Scaling (RSS).
2. No DNS issue.
3. EXBPA report is clear.
Any help would be highly appreciated.
Regards,
Ghouse

All are internal mails and 70 GB free space is there on the disk.
If we dont clear the queue then after three days queue expires and sender receive below NDR.
Delivery has failed to these recipients or groups:
 [email protected] 
The server has tried to deliver this message, without success, and has stopped trying. Please try sending this message again. If the problem continues,
contact your helpdesk.
 Diagnostic information for administrators:
 Generating server:
[email protected]
 [email protected] 
#550 4.4.7 QUEUE.Expired; message expired ##

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