does anyone have problem invoking Google Assistant by voice "OK Google" or "Hey Google"? I have this problem since last update.

If you manually invoke GA by swiping left corner of the screen, then it can invoked by voice for the next few hours. After that, cannot invoke by voice anymore.

I have disabled battery optimization for GA, retrain my voice, reinstall GA and Google services and clear cache.....same outcome.

Hope someone can advise what to do. Thanks.