I've used vscode with the vim plugin for years. All of a sudden I can no longer open files using CTRL+P. Looks like the plug-in intercepts this combination and moves the cursor up instead.
It looks like this issue was introduced in v1.26.0 a few days ago. If you don't use Ctrl+P to navigate in the filepicker, you can disable or change the vim shortcut back to the default VSCode behavior, as noted in the issue:
// keybindings.json
{
"key": "ctrl+p",
"command": "workbench.action.quickOpen"
}