problems with excel

i am facing some problems using excel. i tried using it for the previous 2 applications and it seems fine. when i tried using the same technique for this one, excel will freeze everytime i finish writing data into it.

what could be the possible reason for this? i used excel to connect to my hardware to retrieve values using DDE. there are a total of 11 * 2048 data.

is it because the load is too much therefore excel hangs? it works fine up to the point when i finish writing everything into excel and wanted to save it. then it just freeze there.

please advice