Mortared edges
A thin new skin of mortar over loose old material seldom lasts. If the edge has broken away, defective mortar needs taking out and the verge rebuilding where necessary.
Dry verge
Plastic units should be held by the fixing system, not by improvised sealant. One missing cap can be local. A whole row working loose suggests the original fixing should be checked.
Look at the masonry below
Cracks at the top of the gable wall or gaps behind a bargeboard can allow damp into the same area. The edge is a junction between materials, so both sides deserve a look.
Wind exposure
A gable facing open ground may weather more severely than the sheltered side of the same house. Compare both elevations rather than assuming they age at the same rate.
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