ODBC Refresh Interval

We are using SQL Server as a back end to an Access front end on a LAN using

ODBC linked tables. Users are periodically getting the "data has been 
changed by another user" error, and it's causing them to have to re-enter
a 
lot of data.

The ODBC refresh interval has been left at the default (1500 sec) on all 
computers. I'm wondering if maybe changing that to a much smaller number 
(150 seconds?) would help alleviate the problem. Also, I'm wondering if 
there are other settings that could be tweaked to help with this problem.

Thank you for any assistance.