DBase 4 BLOB Files blowing up

Has anyone come across the problem of dBase 4 BLOB files expanding to
enormous sizes eg   500Mb when they should be about 1.8Mb? We have 3 Win
'95 computers on the network using Delphi 3 and BDE 4.01. We think the
corruption of the blob file occurs when the computer acting as file
server is used for data entry.