"Posting: Single Ledger" concurrent request hanging

Posting: sinlge ledger concurrent program someitmes hangs and does not comlpete.  it remains in running status untill we terminate it and post manually the journals.

there is also a workaround we apply each time it hangs:

1. Cancel the posting programs
   (Posting Single Ledger) using Auto.request (XXBA: Scheduled Programs
   responsibility)
2. Create table gl_bc_packets_hists_bkp_DDMMYY as select * from
   GL_BC_PACKETS_HISTS;
3. Truncate table GL.GL_BC_PACKETS_HISTS;
4. Insert into GL_BC_PACKETS_HISTS (select* from
   GL_BC_PACKETS_HISTS_BKP_ DDMMYY)
5. Commit;
6. Run Gather Table statistics (GL, gl_bc_packets, 100, , , NOBACKUP,
   DEFAULT, LASTRUN, Y)   
7. Run Gather Table statistics (GL, gl_bc_packets_hists, 100, , ,