Shimano Sonora 2500 Reel Question

I have a problem with this reel. After casting, the bail does not flip fully and engage without my manually doing it.
Does the spring weaken over time and need repair; or is there something else I can do?

Close the bail manually. It reduces line twist. With a little practice, it will become automatic.

thats normal on a lot of reels,..everyone just manually flips the bail closed like stated above...easy-peasy !!

take it apart and lube it. but yes close manually is best.