Orbi RBR50 Hourly Disconnect

Hello, i have exactly the same issue. For weeks now. Since Corona i am working fulltime at home, constantly connected via VPN.

Every hour at exact the same time all my connections got reset. 

I loose my vpn connection and internet connection

On all my devices by the way.

My setup

RBR50    firmware V2.5.1.8

RBS50 x2      firmware V2.5.1.8

RBS50Y     firmware V2.3.5.32

I am connected to the RBR50 via ethernet, which is wired via UTP6 to my cable modem.

If i connect to the internet directly i have no disconnects.

My VPN is a Cisco Anyconnect 4.3.03086

My house is about 310 sq meters (3300 sq ft), distance varies from 12m to 6m, depending on the walls (thick brick walls, al ot of concrete and piping).

Connections between them are good. Daisy chaining enabled (RBS50Y connects via one RBS50), roaming is working fine for other devices.

Fixed 2.4 channel, there are 2 or 3 other signals but not that strong.

Beamforming and MIMO and WMM enabled. Under Advanced Tab/Advanced Settings/Wireless Settings

Disabled: Armor, Circle

Set 20/40Mhz Coexistence to 40Mhz only.

Had a factory reset and setup from scratch  since last FW update

This should not be happening to a system that has cost me about 700$

I am no n00b.

Tried changing DHCP lease time via the debug page, but all my clients have reserved IP's, but no change in the disconnects