Can connect to the database, but every few minutes (like 2-5 minutes) seem to loose connection. Connect, run something one minute and try to run something else, but cannot.
ORA-12152: TNS: unable to send break message
This problem is happening to all users.
Some network/firewall security setting is ending the database connection.
Toad does not have any settings that would cause disconnections with the sessions/connections to the database.
There are Oracle and network settings that will automatically disconnect a session; therefore check with the SYS/Network Admin for any security settings that can be adjusted.