Character mesh disappears at certain camera angles

Try to increase the bounds scale value. It’s in the actor blueprint, where you have to select the actor mesh. If you do that, a “details” tab appears to the right. In that tab just search for “bounds scale” and change the value. If you have multiple meshes (ring, hair, shoes…) attached to the main mesh (character body) than you have to change the value of every “sub-mesh” separately.
The smaller a mesh (in relation to the bounds scale of the main object), the higher the bounds scale value has to be for preventing the mesh from disappearing at certain viewing angles.

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