Something I refer to as the "Lost Cause Syndrome".

Basically you start working on a project enthusiastically with the resolution to write the best possible code. But either one (or some or all) of management, client and colleagues succeed in transforming the project into a comedy (or tragedy, depending on your outlook) of errors.

Then finally, one day you decide that the project is a lost cause and stop caring about it. You end up in a "Let's get this over with and get out of here" type of mindset without making any efforts to improve the situation.