When more than one user edit and update the same table, may occur deadlock
Go to Control Panel > BDE Administrator > Click Configuration > System > INIT > Increase the MAXFILEHANDLES value (suggestion would current valueX2).
If can't solve the problem, then increase the value again.
if above solutions can't solve the problem, then you can use Firebire Configuration Manager (FbConfigManager.exe) to change the deadlock timeout value.
if still can't, then need to upgrade their hardware.