Hi Vijay,
From the hit usage the buffer looks ok and a high number of swaps is only a problem if the buffer has no time to do anything other than load and displace objects. You can recognize this situation from the buffer hit ratio. You can use transaction ST02 to determine the hit ratio. The hit ratio should be higher than 80 %.
For mode info please read this below note.
Note 373986 - Overflow of the export/import buffer
Can you please go in the export and the import buffer in st02 and go in buffer objects.
Can you see an invalid entries in there.
Can you also check the below note if you at lower kernel to what mentioned in this note.
Note 1740934 - Buffer synchronization: Avoiding duplicate entries
Hope it helps .
Thanks
Rishi Abrol