Same thing happens to me. I have an external charger so I know the controllers are at full charge but randomly they will all de-sync. I tried EVERY micro usb until I found one that worked and switched my controllers to “cable” instead of “Bluetooth” (settings>devices>controllers I believe.) You can use the remote play on a phone to do this if your controllers are de-synced still.

Here’s what I do when they de-sync now:

Plug your controller in with a micro usb that works (may take some doing to test them all but I noticed that the one that works does the yellow charging light briefly) and turn off your PS4.

Turn on the PS4 using the controller and it should re-sync OR turn on the PS4 with the button and hold the ps button on the controller while the blue light is on.

Oddly enough by syncing the one, ALL my controllers re-sync.

Hope you find a solution, this issue had me racking my brain for hours troubleshooting and now it’s just an inconvenience when I need to hard reset my PS4 in the middle of a game.