Ps4 controller won't turn on or connect unless I reset it

Hello,

My ps4 controller has a problem

I used to connect it to my pc via bluetooth and everything seemed ok until last week

so i connected it to my ps4 and played with it then i put it into rest mode

but the next time i pressed the PS bottun it just kept flashing…it didnt connect automatically, and when the flashing stopped it didnt turn on when i pressed the PS button

so every time i wanna use it i have to reset it or hold the PS button for 10 seconds and then connect it to my ps4 with usb, then it recognized the ps4 and works either wired or wirelessly…

so how can i fix it? im thinking there might be a settings issue

i dont know

thats why im here

sorry about my broken english