You do not know what is causing the problem, do you. Meaning which axis.
Go to the maintenance page, press 0 for more commands, press 3 to select a item to watch in the diagnostic, select par 153.
When it faults, it will display eight digits. One will be a 1 which is where the fault is.
Example: 10000000 is a X fault while 00010000 is a spindle drive fault. If a spindle drive fault, press in contactor 3 which will turn on the spindle drive and you can see if a fault is displayed.
Side note: this machine has DC servo motors that have brushes. Per Bridgeport, the are to overhauled every 4000 hours of operation. Another note, the x and y motor are the same. The Z is much bigger with a higher capacity drive.
George
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)