If you improve or tinker with something long enough, eventually it will break or malfunction.

Some suggestions for you :

A failure will not appear until a unit has passed final inspection.

Don't force it, get a bigger hammer.

Friends come and go but enemies accumulate.

The compromise will always be more expensive than either of the suggestions it is compromising.

Enough research will tend to support your conclusions.

Every clarification breeds new questions.

The Ninety-Ninety Rule of Project Schedules - the first ninety percent of the task takes ninety percent of the time, and the last ten percent takes the other ninety percent.

Every solution breeds new problems.

If your project doesn't work, look for the part that you didn't think was important.