I've had this problem in the past and it has ALWAYS been down to the balance cable breaking down. Each time I've put a new balance loom on (the 3 wires between the board and the cells not the board itself) the problem has been cured.
Just to be certain it is worth taking the saddle packs and charging them as individual 1s packs as opposed to the 2s saddle and make sure the charge shuts off ok like that.
That will prove it's not the charger and that the cells are ok too (plus bring them back into full balance as both halves of the saddle pair will have been 'fully' charged individually).
Hope that helps.
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