There are a number of issues that can happen with strawberries. Renewing the bed is probably the best course of action to do next spring. they will recover much better if done in early spring. when you do I recommend you include a high nitrogen compost in the soil.
this year I recommend encouraging nitrogen to enter the ground. if you use worm castings, compost, NPK fertilizer or what ever a nice even does a couple times over the summer should help you get recovery your harvest.
I am doing a series of videos with strawberries in my garden this summer. if your interested take a look below