quest 3 controller slow flashes 5 times

Have you tried restarting the headset (hold the power button for 30 seconds for a hard reboot) then re-pairing the controller using the mobile app? Make sure the headset and controller are on the same wifi. Select your headset in the app, Headset settings->Controllers, unpair the controller if necessary, then 'Pair new controller'.

Ever fix it? Mine does the same...5 lights then off,  won't pair or reset