connection woes

We have a MS Access 2000 database connecting to psgl 7.4.5 database over
the Internet using ODBC 7.03.02.00 drivers. The connection works sometimes
and then fails sporadically and unpredictably. When it fails, it could be
just opening a table or it could be in a bound form. When it fails, we
sometimes get an ODBC connection error. Sometimes, the table opens up with
each cell filled with #delete#. I'm looking for some general
troubleshooting guidelines.

What makes this frustrating is that we have other experience using
essentially the same techniques that have much greater stability. We are
reasonably proficient with both pg and Access in general, and have naive to
moderate  experience, but until now good luck with the odbc drivers.

I could say more about what we have checked or have suspected. Bandwidth?
Table relations? Presence of text/memo fields? nature of ID fields?  For
initial post, I think I will just see what pops up. Very frustrating.