MacBooks and 5 GHz wifi

I have an early 2013 15" Macbook Pro that has no trouble hanging on to the wifi, 2.4 GHz and 5 G.

I bought my wife a new 2015 13" Macbook Pro and when I close the screen, it drops the signals, both 2.4 GHz and 5.0 G

Both have Yosemite 10.10.4 running and the wifi setting are identical to the MacBook Pro that works.

Her laptop is less than 10' from the router. Mine is right next to it.

I am perplexed as to why they behave differently.

 

It only happens when I close the lid to put it to sleep even if plugged in to power. If I go to the upper left Apple and put it to sleep, it's fine as long as I don't close (fold down) the lid or screen.
Wakes up still connected to the internet as long as I don't close the notebook up while on corded power. If I power down, it doesn't matter whether the screen was folded over or not.
I even moved it next to the router, same thing on battery, looses connection if it sleeps whether the lid is folded own or not.

 

os x 10.10.4, yes both are up to date.

 

On my Macbook Pro 15" early 2013 model. When I open the lid, wireless internet is there and solid. This is on power or battery.

On my wife's new Macbook Pro 13.3" when you close the lid it looses the wireless internet connection on battery or power cord. It is a pain to get back for her. Turning off wifi and then turning it back on works but that seems to be a work around, at best.

Both Macbook Pros are running the same software Yosemite 10.10.4 The network settings are the same.

I guess my question is; Why isn't the new Macbook Pro turning the wireless back on without any hassles.
I'm not always around to do it for her.

 

No difference, just checked them both.