Copies being made and Records being deleted by Access

I'm using Access 2003. I've been creating and using Access databases for 12
years but never encountered this problem before...

The databases are stored on a network drive but usually are only open by one
person at a time. It started when our servers were moved off-site. On
occasion Access will create a copy of the database naming the copy db1, db2,
etc. It does this for some people on my team but not everyone. We use these
files everyday, mostly just entering some text on a form.

Also, twice this month, Many records were deleted from one of my large
tables. The first time it only left exactly 15,000 records in the table.
Yesterday it only left exactly 40,000 records. The table had over 70,000
records to start with. There were no action queries or utilities run other
than the Compact on Close.

Not sure if this is related or not but... sometimes our form won't display a
record that we know exists (It shows in the combo box but won't return
anythign when selected). If we wait a while it will display it. All of the
above leads me to think that it's an issue with the network connection.

I would appreciate any help you can provide as to how to address these.