Cisco RV016 dropping company POP3 connections

I am getting crazy with our Cisco Linksys RV016. It handles 3 simultaneous connections to the internet using 3 ISP.
All our company goes to the internet using this cisco linksys RV016, our corporate switches are connected as clients to the router.
Sometime ago, this router started to drop POP3 connections to our network, when this problems is present, all users get Receiving' reported error (0x80042108) in Outlook 2007-2010.
Currently i have setup POP3 service to use the First ISP connection, but when this problem is present, the only way to eventually resolve it is to switch the link POP3 Service from the First to the Third ISP, sometimes it works immediately, sometimes don't.
We are using this router since 2007 but this problems started to arise from this month.
Our switch is the latest firmware available is Cisco website, this is the Firmware Version: 3.0.2.01-tm.
any tip, suggestion, will be really appreciated.
thanks in advance.
Sergio.

This issue is getting more strange behaviour. Since Monday, it occurs between 4.30pm and 5.00pm and after about 30 minutes it goes away without my intervention.
Is it the CISCO RV016 throughput maybe ?
Is it because i use Intelligent Balancer (Auto Mode) on all my 3 WANs? Should i use IP Group by Users instead?
Thanks,
throughput

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Message was edited by: erockdabass
Message was edited by: erockdabass

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iPad, iPhone, iPod Touch, all have no issues at all with my Airport Extreme Base Station. Can stay connected throughout my living room, bathroom, bedroom, no issues whatsoever.
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I thought that it was an issue with my MacBook Pro, but then my sister visited with her brand new MacBook Pro 2.26 Intel Core 2 Duo, and while a month ago she was able to connect, DHCP, and browse without issue, this weekend she had all of the same issues I was having.
My XBOX 360 and MacBook Pro have absolutely no issues with the wired connection. Only my WAN seems to have this issue.
Did you ever find anything more to this?

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