Replacing Switch Used for HA Pair

[TheTechGod]

Hello - New to the Community and Wondering if Someone had some thoughts that I am missing.

I have a branch that uses an HA Pair in Active-Active mode running through the Primary Adtran Switch of a Four Switch Daisy-Chain.

I have taken over for an MSP and Previous Admin that are no longer hired by the company and our current MSP is unable to resolve the current problem and neither them or myself are able to login to the current switch to review the setup used for the HA.

The switches are old and need to be replaced since they are End of Life. I have attempted to establish the new switches with an HA configuration for the HA pair and all looks good, except that I now have packet loss and dropped packets about every 20 packets.

The HA was in Active-Active Mode and I have the ISP Connected Ports Trunked with LACP enabled along with one respective connection to each FortiGate (A and B) that are also LACP Enabled. STP is setup and Loop Protection disabled.

I have reviewed the setup documentation published by FortiNet and I can access both the ISP Circuits. Internet is available and I can see the rest of the WAN via the Metro E Circuit, but some apps will not load due to the unstable conditions with the packet loss.

Is there something that I am missing or does anyone might have some thoughts? Our current MSP is also unable to correct the problem, so figured that I might ask.

Would we need to move to Active-Passive? From looking at the Interfaces, there are no VLAN's setup previously and the HA Ports are assigned correctly.

Thanks,

[TheTechGod]

Sorry, meant Loop Protection Enabled.