I have faced the same issue. Did you perform any reset recently? Or, did you update the software recently? If so, you should have selected update and restart instead of update and power down. If you had chosen the latter, it could be the cause of this issue that you are facing.
If you are being prompted to reboot the laptop every now and then, better avoid doing so; because, if you reboot it using the power button, you will encounter the same issue again.