Pep link balance 20

I am new to this.

I have ATT Uverse as my primary provider attached to WAN1 and verizon wirless as secondary on WAN2.

Even though my signal and connection with both providers are solid with no drop out and shows connected, my internet keep on dropping.

On the log, I see the following every time

MAC address conflict: Received an ARP packet claiming to be from our MAC address 10:56:CA:19:0A:E0, but with an unknown IP (0.0.0.0)

I also need help in setting them as primary and secondary and making them load balancing and falling to each other in case of any issue.

Thanks a lot,