[VS Code Ext 2.0.0] Deployment sometimes says Visual Studio has Connected and then halts

[NevynUK]

A new application was created for the F7 2.c, so a basic Blinky application.

Debugging was started (using F5) with a break point on the first statement in the Run method.

The Debug Console shows the deployment and the OS starting and then the message Visual Studio has Connected.

Sometimes the system halts there, the breakpoint is not hit and Blinky does not run on the board. No error or diagnostics are displayed.