Use laundry additives only where the appliance and product instructions permit them. A model may have specific advice about residues or sensing surfaces.
Understanding this situation
A sheet intended for a dryer is not automatically compatible with every programme, fabric or technology. Introducing it at the same time as a performance change is relevant history, but does not prove causation.
A useful next step
Check the manual and textile labels before use. If a new residue or result appears, record the product and follow approved cleaning advice. Do not add several products to compensate or use abrasive cleaning to remove an unidentified film.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.