I am having a problem with my application randomly freezing throughtout the day. I get an error message in the stating "object reference not set to an instance of an object." It appears to be happening in the authentication section but there are other indications that the problem is with the reference to the dll because when the system freezes, errors pop up throughout the application indicating it can't get to the code it needs. I can repair it by replacing the bin directory and everything will run fine. The error, however, seems to be random but when it happens, everyone is locked out of the application. I have run out of ideas...please help if you can. Thanks!