Sounds like there's a cell starting to go bad, Taking longer to balance is a good sign of this. Otherwise if your charger shows internal resistance measurements, this would confirm what cell it is.
There's no way to bring a lipo pack back up to a fresh state.
2Years use isn't that bad
You can cut the pack open and make a new less cell battery, but it's not worth it, unless you have another pack that's in the same situ and make one battery out of the two packs.
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