It could be NAT-T problem. Try this registry modification. https://community.tp-link.com/en/business/forum/topic/668064?replyId=1365466

This problem could be related to NAT-T in Windows. Check Google: NAT-T Windows 10/11 1) Open the registry editor in Windows. Select Start -> All Programs -> Accessories -> Run, then type 'regedit'....

@Hank21 I reconnected AP, forgot it And readopted. Now I am waiting if problem persists. Edit 22.4.2024: Till now I have not suffered from this issue.

Disconnecting after update to newest firmware 5.1.6 EU. I have no problems before update. It is under linux controller 5.14.0.11.

@Tedd404 I think that OpenVPN solution is discussed here https://community.tp-link.com/en/business/forum/topic/653224

@Clive_A I am using PPPoE VDSL connection. IT IS not possible to switch to different WAN connection type. I am using DSL modem which I cannot put in different mode (other than bridge mode).