PowerShell process CPU spikes, terminates

System Details

Operating system name and version: Windows 7 Enterprise SP1
VS Code version: 1.19.1
PowerShell extension version: 1.5.1

Output from $PSVersionTable:

Name                           Value
----                           -----
PSVersion                      5.0.10586.117
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.10586.117
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

Copy / paste the following commands into the PowerShell Integrated Console, and paste the output here:

-> code -v
1.19.1
0759f77bb8d86658bc935a10a64f6182c5a1eeba
x64
-> $pseditor.EditorServicesVersion

Major  Minor  Build  Revision
-----  -----  -----  --------
1      5      1      0

-> code --list-extensions --show-versions
bibhasdn.unique-lines@1.0.0
DotJoshJohnson.xml@1.9.2
Ionide.Ionide-fsharp@3.15.4
jsynowiec.vscode-insertdatestring@2.2.0
justusadam.language-haskell@2.4.0
ms-vscode.csharp@1.13.1
ms-vscode.PowerShell@1.5.1
sensourceinc.vscode-sql-beautify@0.0.4
UCL.haskelly@0.4.29

Issue Description

My powershell.exe process routinely shoots up to at least 25% CPU when I attempt to send a statement to the integrated console, and the statement takes 10-15 seconds to execute - but only after several minutes of inactivity in the editor. Subsequent immediate attempts execute immediately unless I let several more minutes go by.

Looking at the logs now, it seems like the PowerShell process keeps shutting down. Is that normal?

Attached Logs

logs.zip

PowerShell / vscode-powershell