Open replicator (OR) Hot Push session slows down from 850 MB/s to 0

Open replicator (OR) Hot Push session (Precopy) slows down from 850 MB/s to 0 in a few hours. Can anyone help?

Model : VMAX10K

Code: 5876

symqos -rcopy list ceiling -dir all -sid xxxx

Symmetrix Remote Copy Bandwidth Ceiling

Max Set Actual
Dir:P (MB) (%) (MB)
------ ---- ------- ------
01E:00 300 100 2
01E:01 300 100 0
02E:00 300 100 0
02E:01 300 100 0
01F:00 300 100 0
01F:01 300 100 0
02F:00 300 100 0
02F:01 300 100 0
01G:00 300 100 0
01G:01 300 100 0
02G:00 300 100 0
02G:01 300 100 0
01H:00 300 100 10
01H:01 300 100 0
02H:00 300 100 0
02H:01 300 100 0