SA540, two ISPs, not stable. Help required

Hello everyone, I'm having serious issues with this device. We count with two units, one of them is meant to replace an RV016 router in our main building...
The problem is: The Internet access (web browsing, ICMP, etc) is intermittent or not working at all when using SA540 devices.
- One ISP provides a dynamically assigned IP address, the other one provides quite a few static IP Addresses.
- For early minutes after a power cycle, the Internet access seems to work fine. Slow, with hiccups (random packet loss); but it works.
- After ~3 minutes, ping start showing timeouts and the web browsing stop working.
Once this state was reached, the next tests were performed:
- Disconnect one ISP and check behavior. Repeat with the other ISP.
- One ISP was connected to an intermediate 10/100/1000 switch before reaching the WAN port (Check this post:
https://supportforums.cisco.com/thread/2126259 )
> This was done weeks ago, with default firmware and then the procedure was repeated with upgraded firmware. Same results.
> We started testing the second unit, to ensure the previous unit was not malfunctioning or defective. In such "tests", we configured the device in the default 192.168.75.0 /24 segment and we attached the WAN interfaces to our LAN (behind the RV016 LAN). All the computers used for testing behind the SA540 LAN ports, were able to browse internet, download large linux ISO files and start RDP sessions without problems for days.
Another important observation was: While connected like this, the SA540 web interface was very fast and lightweighted in comparison with the ISPs directly connected to the WAN and Optional interfaces. Both ISPs provide connectivity using Ethernet. One is a standard CATV+internet ISP, while the other is a more 'enterprise-level' approach with FTTH.
We're running in circles! Any help, tips or recommendations will be greatly appreciated!
Thanks in advance,
Agustin.
Buenos Aires, Argentina.

Austin,
Thanks for laying out the sketch.  That helped to understand what you've done to date.  Based on it working behind the RV016, this leads me to believe that there is configuration in the RV that isn't present in the SA.  Is it possible that one or both of your ISPs do MAC Address filtering and the MAC of the RV is currently configured in their system(s).  Obviously you could call them to find out.  Alternatively, you can use the MAC Address Source drop down under Networking -> WAN -> IPv4 Config.  You can change it to "Use the following MAC Address" and input the appropriate RV MAC Addresses in the appropriate WAN interfaces and then test.  If that doesn't fix it, I would recommend checking all your settings again to ensure you have everything set correctly compared to the RV.
Shawn Eftink
CCNA/CCDA
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