2015 NST's are crashing with strange errors

BennyVL

We're having troubles with all our 2015 NST's (CU8 - CU10)
Some of them are running "on site" (Server R2012R2 - CU10) and one is running on Azure (Server R2012R2 - CU8)

Errors in the event logs (CU10)

Faulting application name: Microsoft.Dynamics.Nav.Server.exe, version: 8.0.42222.0, time stamp: 0x55ba8f8d
Faulting module name: System.Core.ni.dll, version: 4.0.30319.34209, time stamp: 0x53489a70
Exception code: 0xc00000fd
Fault offset: 0x00000000002c0d5d
Faulting process id: 0xb0c
Faulting application start time: 0x01d0e57b42b013c8
Faulting application path: C:\Program Files\Microsoft Dynamics NAV\80\Service\Microsoft.Dynamics.Nav.Server.exe
Faulting module path: C:\Windows\assembly\NativeImages_v4.0.30319_64\System.Core\46fd4ebe653525ccd36c7cd90b3603e1\System.Core.ni.dll
Report Id: a4095298-516f-11e5-80d9-005056b0351f
Faulting package full name:
Faulting package-relative application ID:

Faulting application name: Microsoft.Dynamics.Nav.Server.exe, version: 8.0.42222.0, time stamp: 0x55ba8f8d
Faulting module name: mscorlib.ni.dll, version: 4.0.30319.34209, time stamp: 0x53489fcf
Exception code: 0xc00000fd
Fault offset: 0x00000000004686ea
Faulting process id: 0xcdf8
Faulting application start time: 0x01d0e55e8b2c3ee9
Faulting application path: C:\Program Files\Microsoft Dynamics NAV\80\Service\Microsoft.Dynamics.Nav.Server.exe
Faulting module path: C:\Windows\assembly\NativeImages_v4.0.30319_64\mscorlib\701f2b79b02a02beba70e50bb2edb212\mscorlib.ni.dll
Report Id: ea48ed4d-5152-11e5-80d7-005056b0351f
Faulting package full name:
Faulting package-relative application ID:

Errors in the event logs (CU8)

Faulting application name: Microsoft.Dynamics.Nav.Server.exe, version: 8.0.41370.0, time stamp: 0x5568b9bc
Faulting module name: mscorlib.ni.dll, version: 4.0.30319.34209, time stamp: 0x53489fcf
Exception code: 0xc00000fd
Fault offset: 0x00000000004686ea
Faulting process id: 0x12d0
Faulting application start time: 0x01d0e5708610db9c
Faulting application path: C:\Program Files\Microsoft Dynamics NAV\80\Service\Microsoft.Dynamics.Nav.Server.exe
Faulting module path: C:\Windows\assembly\NativeImages_v4.0.30319_64\mscorlib\701f2b79b02a02beba70e50bb2edb212\mscorlib.ni.dll
Report Id: 1a16d519-5164-11e5-80c4-000d3a219914
Faulting package full name:
Faulting package-relative application ID:
Anyone else who has these strange errors?

Capone

Are these the only errors that appear in the eventviewer? Sometimes there are several information events when it crasches.

Do they crash randomly (user error) or only on startup?

Haver you verified that you have the same builds (CU) on both the clients and servers?