Having problem while downloading some files.

[just.starting@gmail.com]

I am having problem while downloading files from an apache server2.0.53
with php4.3.10.While downloading some files it generally stops after
downloading some specific amount and then stops downloading with the
error message: "the source file could not be read". And the error is
not dependent on the size of the file, as I can download a file of 6MB
but having problem with a file with 652KB. It always stops after
666880bytes.

Thanks.