DarkRP MySQL problem

So about once a day on my server new players joining begin as joining/connecting and they cannot see any of their player data from darkrp, i look in my MySQL database and this is at the bottom:
Connection for controluser as defined in your configuration failed.

so i login to SSH and reboot the MySQL service, but the error persists ingame, the only way i found to fix it was to restart the actual gmod server, does anyone know why this is happening? i cannot keep restarting 2 times a day to fix this.

Thanks in advance!