Wifi drops when streaming horizon

Hi guys,

Ever since I found out that I could watch tv on my laptop via horizon tv (a tv streaming service of my internet provider, Ziggo), I use it. I stream within safari via a webpage. Safari's up to date.

But, when streaming and simultaneously working on something else (another webpage, viewing photo's with preview, or working with adobe [illustrator or photoshop are the worst]) my WiFI keeps dropping. The wifi symbol in the right hand corner just 'empties out' (so no connection with the WiFi networks, no bars whatsoever). It takes a few seconds and then it reconnects again, only to fail again after half a minute or so.

As you can imagine, this is very, very, very frustrating.

I've swapped switches and WiFi access points, changed WiFi preferences (channel and such, checked with the wifi diagnostics to find best channel etc.) and tried other networks within my main network at home (we have a total of 2 WiFi access points on top of our main router since it can't reach the whole house). Nothing seems to work. The Wifi Access points are cisco, the switches are from netgear and the modem's from ubee. The main router is a (rather intimidating looking) Netgear.

My wifi access point is connected to a 100mbit switch which is directly connected to the main router which is directly connected to the modem.

But, since the rest of my appliances seem to working fine when I stream something, I'm afraid it's got something to do with my laptop.

Which is frustrating, because it's relatively new and a major upgrade since my last macbook.

I've got a new macbook pro retina 13" (bought last december) with the following specs:

2,9-GHz processor
512 GB harddisk

• 2,9-GHz dual-core Intel Core i5
• Turbo Boost tot 3,3 GHz
• 16 GB 1866-MHz LPDDR3-geheugen
• 512 GB PCIe-flashopslag¹
• Intel Iris Graphics 6100

On top of this I use an external monitor via the displayport & VGA.

So I really hope someone can help me, maybe it's some streaming-processing file on my mac which interferes with WiFi when I'm doing more than just browsing internet? Because the issue only seems to pop up when I'm streaming something AND working on something simultaneously (a webpage often reloaded, a 'heavy' program like one of the adobe suite)..

Thanks in advance.