My Fit 2 Pro was at 80% battery yesterday but when I woke up it was dead. I put it on the charger and it almost instantly began overheating. I took it off to cool down and tried putting it on the charger again. An hour later it still would not turn on. 3 hours of charging later it finally turned on with 25% battery, and now the screen flickers white while it's on the charger. A factory reset did not fix the issue and it is still slowly charging with a flickering screen.
Thank you for reaching out. I can understand doing so experiencing these symptoms. If after a reset of the device you are still experiencing this I would recommend getting your device evaluated by a technician. I would be happy to look into this for you, could you please provide me with the model and serial number in a private message? https://bit.ly/2SUXRar