3D Print of Small 8 Day Clock

Hello Steve, a few days ago I finished printing and assembling my clock. It was all very easy and it turned out very nice.
But now I have a problem and I need your help. The clock works for 2 hours, sometimes 3 hours, even 4 hours, and then stops working.
I have lubricated it, increased and decreased the weight of the pendulum, and used a weight of 3 to 6 kg, but the problem persists.
I no longer know how to proceed to fix this problem. Do you have any tips I could try?
Thank you very much again