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How to save a cracking oak stairs?

I have an important problem, and I am in desperate need of good advice. A couple of years ago I added a balcony landing with stairs to the house. I chose oak for the stair struts. During the first summer, I occasionally inspected the stairs and noticed that more and more cracks were appearing in both the stringers and the steps. The stringers were sawed out and glued back together. That glue joint is now also opening up. I am not an expert, but in my opinion the cracks are too severe. I have attached some pictures. The cracks are 30 to 80 cm long and up to 4.5 cm deep.

I would like to hear your opinion. 

• cracks
• cracking oak
• oak stairs