Inbound to Z1file failed to get the Batch number

Dears,

I tried to load the SFC calendar via P0007Z1, and it works OK to pull records from Excel but when plan to save to get the batch number in F0007Z1 it depends:

If the records are around 60 then no problem, however, if the records are bigger than 70 then no batch number pumps up, and looks like nothing happen. (no F0007Z1 written).

Different browsers come with the same result. But if tested in Steltix demo environment it took 500 records with no problem.

Doubt if this is the hardware issue and where would you suggest starting the troubleshooting? Thanks!