Why is "Hey Google" not working after restarting my phone?

Question

Each time I restart my phone, Hey Google doesn't work. I have to retrain it my voice everytime. I will say "Hey Google", "Okay Google" and nothing pops up on the screen. No assistant, nothing. So I go to the settings retrain my voice, and then it'll work. It only happens when I turn my phone back on. Never have an issue with it any other time. If I don't retrain my voice, it just won't work.

James M. · Accepted Answer

Welcome to the Google Assistant help community. 
Search for your device at
https://www.gsmarena.com/
 
to determine if your device has what you need and supported Language to use Google Assistant app
https://support.google.com/assistant/answer/7172657?co=GENIE.Platform%3DAndroid&hl=en
 
If not supported, please contact your device manufacturer
https://support.google.com/android/answer/3094742?hl=en
 
If device and language are supported, try each of the following steps before moving on to the next to see if your Google Assistant issue is resolved:
 
Let your voice open the Google Assistant
https://support.google.com/assistant/answer/7394306?co=GENIE.Platform%3DAndroid&amp;hl=en#zippy=%2Cphone-or-tablet
 
If your Android phone isn't responding when you ask Hey, Google , go to https://support.google.com/assistant/answer/7283669?hl=en&ref_topic=7172845
 
Open Android Settings > Apps > Google (G) app > Permissions > turn ON every choice provided.
 
Turn your Android device OFF and back ON.
 
Try clearing the Google (G) app Cache. Important: Settings can vary by phone. For more info, contact your device manufacturer. Clearing cache can free up needed space by removing temporary files. This is a short-term solution. Over time, cache will build up again.
Open your phone's Settings app.
Tap Apps & notifications.
Tap the Google (G) app. If you don't see it, first tap See all apps or App info.
Tap Storage & cache  Clear cache.
Turn ON personal results
https://support.google.com/assistant/answer/7684543?hl=en&amp;co=GENIE.Platform=Android
 
Check to see if all of your installed apps on Google Play automatically update at https://support.google.com/googleplay/answer/113412?hl=en
 
Is your Android operating system updated? Open Android Settings > System (or About Phone) > Advanced > System Update > Check for update. If device updates, restart phone when update is complete.
Check to see if your Android phone has your home address entered at https://support.google.com/assistant/answer/7394009?co=GENIE.Platform%3DAndroid&hl=en
 
Open Google Play Store > search for Google (G) app > open app > Uninstall > OK > Update > wait for update to install > Restart phone
 
If you have a Samsung device, see "Change your default phone assistant" to Google Assistant
https://www.samsung.com/us/support/answer/ANS00077672/ 
AND
Open Bixby app > App details> Bixby Voice > Set by default > disable by default
 
If your device uses a third-party OS (operating system) instead of an official Android OS, please contact the Android device manufacturer support.