Hello@Ryan_J ,

Thanks for getting back to me.

The Local support refers to TP-Link's local technical support in your area. You can usually find their hotline and support email address on the official website. Click here.

For your case, we recommend sending an email to local support email  with the following information:

Subject: [Forum Escalation][ID 837928] Enabling the Flow Controller causes severe network jitter and packet loss on Archer BE800.

Forum Nickname: Ryan_J

Thread URL:https://community.tp-link.com/en/home/forum/topic/837928?replyId=1627332

Model&Version: Archer BE800_V1_1.2.4

Description: 

- Enabling the Flow Controller causes severe network jitter and packet loss, and significant buffer overflow; disabling it restores normal operation.

- Disabling the Flow Controller results in upload speeds less than 1/4 of those with the Flow Controller enabled.

- Enabling or disabling QoS has no significant impact.

Any Other Relevant Information:

Please attach the backup file and system log on your BE800 for further investigation.

How to view and save System Log of TP-Link wireless router

How to create and restore from a backup file on your TP-Link Router

Once sent, a ticket will be created in our support system, and a member of the team will follow up to gather more information or troubleshoot the case.