Hi  @JB_ 

Thanks for your posting.

Would you please share a screenshot of the MLO SSID config?

When the issue happened, was there any high traffic internet activities, such as download videos? 

1. When did you first notice this issue? Did it exist since the EAP was installed or after some normal usage?

Also, could you please help us to confirm the following to make sure my understanding is correct:

1. The S25s work well with non-MLO networks?

2. Both of the 2 EAP773 are having this issue with S25?

Hi  @JB_ 

Thank you so much for taking the time to post the issue on TP-Link community!
To better assist you, I've created a support ticket via your registered email address, and escalated it to our support engineer to look into the issue. The ticket ID is TKID250514023, please check your email box and ensure the support email is well received. Thanks!
Once the issue is addressed or resolved, welcome to update this topic thread with your solution to help others who may encounter the same issue as you did.
Many thanks for your great cooperation and patience!