Wireless network slows during heavy traffic, need help isolating the problem. :)

Hey everybody,

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We are having some problems at work. At their busy times, the wireless slows to a crawl. So i got what information about the setup I could and i was wondering if you guys could give me any advice on isolating and correcting the problem.

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Here is the setup:

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There are about 20 wired computers, around the same amount of voip phones and Id say no more than 20 cell phones using data through wifi on this network. There may be some kind of video conferencing system but they are not using it.

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Modem Data:Arris Surfboard docsis 3 modem.

Multimendia Terminal Adapter: Arris tm804

Firewall: Fortigate fg-60e

Voip System: Allworx Connect 530

Switch 1: Netgear 5 port, not sure if gigabit (gs105) or 10/100 (fs105)

Switch 2:Tp Link t1500-28pct

Switch 3: Netgear gs748t v4h2

Switch 4: Netgear gs510tpp v1

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So the setup is like this. Switch 2 handles voip, switch 3 and 4 are for data. A cable from the surfboard goes into switch 1, then 2 cables come out, 1 goes to a wan port on the fortigate fg-60e and one goes to a port on the network port on the allworx connect 530. This is not setup correctly right? Then on the arris tm804 there are two cables with a twisted pair going to 2 ports on the tplink switch, ( I believe they could be going somewhere else I could not really tell).

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Everything appeared to be setup correctly from the firewall, 1 cable going to switch 3 and one cable going to switch 4.

Then from the allworx there appeared to be a cable going to the tplink switch.

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Here are my questions:

1) Should there be that 5 port switch, shouldnt the line be going to the firewall and then form there, a cable from the lan port to the voip system? I would have to worry about nat being done twice correct?

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2) If the allworx handles the voip, then why is there a second set of cables going to the tplink from the tm804? Does it add more channels? What is its purpose? I am under the impression the surfboard handles data for voip.

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3)I think that 5 port switch is 10/100, obviously that is not enough, but if its gigabit would it suffice, if it should even be there in the first place.

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4) I would like to know anything you can spot we did incorrectly or that could be improved.

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Thanks for any help guys. I know i may not be explaining things correctly so tell me what you need to know and i will provide the information.

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-Brandon