What kind of feeder was it, if you don't mind me asking?

I have a 30 yr old Sweeney feeder that I havent had many issues with, even with really wet conditions sometime over the yrs, except when the seal was going out of the site glass.

I figured out what was causing the issue and after taking the site glass out and completely re sealing it, it was good to go again.

You might check to see if you have a seal or something like that getting weak.

Good Luck!

All the really good ideas I've ever had came to me while I was milking a cow.