I had a issue with my controller where it would lose connection and appear to power off when I signed into my account. It would function on the blue screen before the sign in. What I did to fix it was to power off the PS4 and then I held the power button until I could hear to beeps. I plugged the controller in and selected “Reset Default Settings”. This walked me through the process of setting up my controller, network and time again. No data was lost. After that my controller functioned correctly.