Thin Clients disconnect to RDS spontaneous

Hello.

We have an environment of approx 100 units going from 3010, 5010 to 3040 and 5070 models.

Out of the 100 about 70 units are on WMS and have been running ok. After update from WMS 1.4 to 3.3.1 then later to 3.6 we are experiencing all units disconnecting its self from RDS randomly some after 10-15 min others going for hours then disconnecting. The RDS environment haven't been updated or changed. (older units dont have the problem when not on WMS)

All units are running the same Policy managed from WMS. The log on the unit just says Disconnecting with no reason.

Any got any good ideas?

The policy that have been set is as follows. (Have removed sensitive info)

ThinOS

Configuration Item Value
Sign-on Settings
Require domain login No
Disable guest users No
Privilege Settings
Privilege level High
Admin Mode
Enable Admin Mode No
General Settings
Enable Gkey reset Yes
Enable Trace No
Remove Certificate (8.5+) No
Auto-install Certificates Yes
Certificates ServerCert.cer
Disable ThinPrint Service No
Encrypt local flash No
Disable VNC Shadowing No
Fast Disconnect Key No
Security Policy
Security Policy (8.5+) Full
TLSCheckCN (8.6+) No
Secured Network Protocol (8.5+) No
TLS Minimum Version (8.5+) TLS 1.0
TLS Maximum Version (8.5+) TLS 1.2
DNS File Server Discover (8.5+) No
VNC Settings
Enable VNC Yes
VNC Password ••••••••
Encrypt Password (8.5+) No
Max Concurrent VNC (8.5+) 0
Zlib Compresssion (8.5+) No
Prompt user on start No
Prompt user on end No
View only No
Force 8bit No
WDM Service
Disable WDM Service No
Quick Mode (8.5+) No

Keyboard Settings (8.5+)
Character Set ISO 8859-1(Latin1)
Keyboard Layout Danish
Keyboard Repeat Delay 1/3 Second
Keyboard Repeat Rate Normal
Key Sequence Yes
Ctrl-Alt-Del Yes
Ctrl-Alt-Up No
Ctrl-Alt-Down No
Ctrl-Alt-Left No
Ctrl-Alt-Right No
Win + L Yes
Alt-Tab No

Visual Experience
Desktop Appearance
Desktop Color (8.6+) #106424
Desktop Wallpaper Enable wallpaper
Wallpaper File img0_1024x768.jpg
Wallpaper Layout Stretch
Company Logo No
EULA at login No
Visual Experience
Classic Desktop vs Zero Launchpad Classic Desktop
Action after All Sessions Exit None
Remote Connections
Connection Broker Settings
Select Broker None
Manually define direct RDP connections Yes
Direct Connections (RDP)
Audio Playback Play locally
Connection Name RDS Server
Host Name or IP Address RDS Server
Auto Start Yes
Reconnect After Disconnect No
Domain Name Domain
Color depth 32-bit
Session Window Behavior Full Screen
Session Behavior Defaults
Font Smoothing No
Advanced RDP protocol features No
Peripheral Behavior
Printers No
Serials No
SmartCards No
Sound No
Enable USB storage disks No
Enable USB Redirection Yes, but exclude some devices
Exclude disk devices No
Exclude audio devices No
Exclude printer devices No
Exclude video devices No
Mouse queue timer 20
Additional Settings
4 pixel Aligned Session Width No

ThinOS 9.x

Privacy & Security
Certificates
Auto Install Certificates yes
Select Certificates to Upload Name
ServerCert.cer

Broker Settings
Global Broker Settings
Default Broker Type None

Session Settings
RDP and AVD Session Settings
RDP Direct connection collection RDP description Host Name Reconnect Fullscreen Use RD gateway
RDS Server RDS Server 0 yes no

Personalization
Desktop
Desktop Background Image Name Type
img0_1024x768.jpg image

Peripheral Management
Keyboard
Keyboard Layout Danish

Network Configuration
Proxy Settings
Enable Proxy no

Services
VNC Service
Enable VNC Daemon yes
Password ****************************************************************************************
WMS Settings
Enable Advanced Configuration no