If you prioritize your training to focus on generality and volume of work, you will set a better foundation to push the bench press harder and longer and keep it from stagnating.
Functional overreaching is essentially short-term overtraining where you have a goal of digging yourself into a recovery ditch. Two weeks—two ball-busting weeks. Get to work and reap the benefits.
If you struggle to lose weight eating the same amount of calories that once allowed you to weigh a lot less, then it is a good indication your metabolism needs some work.