Macbook pro retina display wifi connection problem.

Macbook pro Retina display - 3 weeks old - connects erratically to home wifi over Airport Express
iphone and iMac connects to the same wifi network. I am connecting through iphone hot spot to write this question. please help.

I have posted my solution  i.e. update airport utility software. Ocourse you needa working internet connection for that!
I have a 27 inch imac, mac book pro, mac book pro with retina display, iphone 4, iphone 4s, 2 x iphone 5. Each device was showing erratic internet connections at some point in time or the other.
I just updated Airport Utility Software. You can find it in Applications/Utilities. When you click on Airport utilities, it opens a window with 2 icons. The bottom icon will look like your airport express. click on that and then you will get info on the right. If , I repeat if, your Airport utility software requires updation, you will be prompted in the info box. Click that and then you will be fine.
However, the irony is that you need an internet connection for this. I set up a hot spot on my phone and did it.

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    • It’s possible the update is not being applied correctly because the item “MacBook Pro Retina Display SMC Update 1.2” is still in Software update after subsequent attempts to apply it
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    I have provided this detailed documentation in the hope that someone who understands this system can say exactly what is going on. It's meant to be a dream machine but now you can hear the fan from across a large room, the battery doesn't charge and is in fact not recognized so I lose data if the Magsafe adapter gets unplugged, and I have to reset the system date each time I restart the notebook.
    I've used this notebook with utmost care for a little more than a year, this investment of over $3,500 could have bought 3 high end notebooks from DELL or HP but I chose Apple.
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