Degraded Print Quality

Greetings, I have been trying to figure out why overtime my printer (1.5XT using PLA) is experiencing a lower quality of prints part of this was due to a nozzle in need of replacing but overall when I try to print an object that I have printed before it is coming out terrible (no change in settings) I even tried to print the G Spiral test print and it started out OK and got worse with time