Spam Catcher writes:

Is it worth getting this timer repaired? Does anyone know if there is a
simple fix for this issue?

Typically this is caused by the bearings in the synchronous AC motor
wearing out. Some suppliers stock the replacement motors.

However, if you are running a kilowatt of lighting, you are spending $100s
per year on power controlled by this thing, and it would be worth it to buy
something more precise in timing versus sunset. An hour a day will save
you $50 per year. The Intermatic Web site will help you.