Changing SystemTime freezes WPF buttons

Question

I faced a very weird situation. I'm working on an C# WPF application with MVVM pattern. The app has a page from where user can change system time. And there is a NEXT button, which is binded to an AsyncCommand.

The problem occurs when I press the NEXT button. The system time is updated (both date & time values), but right after that, the NEXT button freezes. It is visible, but the command has stopped working. However, I have another CANCEL button which is still available and works perfectly fine.

Could be something similar to this question: SystemClock freezes the system, but I couldn't find a potential cause or solution.

I tried to set system time in 2 ways: one using the SetSystemTime() API and the other one using a Powershell cmdlet. For both cases it ended up with that freezed NEXT button.

For any other cmdlets, the application works fine.

Does anybody faced the same situation ?

[UPDATE with code]:

    public void SetSystemDatetime(string selectedDate, string selectedTime)
    {
        var process = StartPowershellProcess($"Set-Date -Date '{selectedDate} {selectedTime}'");
        process.WaitForExit();
    }

    private static Process StartPowershellProcess(string arguments)
    {
        var startInfo = new ProcessStartInfo("powershell.exe")
        {
            UseShellExecute = false,
            WindowStyle = ProcessWindowStyle.Hidden,
            CreateNoWindow = true,
            Verb = "runas",
            Arguments = arguments,
            RedirectStandardOutput = true,
            RedirectStandardError = true
        };

        var process = Process.Start(startInfo);

        return process;
    }

Actual cmdlet: Set-Date -Date 'MM-dd-yyyy HH:mm'