Activity App Greyed out after every charge

I was having similar issues as another person in here about the activity app being greyed out after charging it and then it taking sometimes hours to start tracking. I spent 6 months working with apple support to figure out a solution and even after referring to the engineers, no one could figure it out. We even narrowed it down to only happening at my house, so we called comcast together and had them provide a new router,l since we thought it was my WiFi. No luck.- problem persisted but only when i was at home. The final answer was just get a new watch. BUT THEN I tried a different charger and wouldn’t you know, no issues. Moral of the story- be careful with after market chargers!!!! Try a different charger, and not a stand one.