What slowed down?
Was the engine fading as the work began? Did it sound normal while less snow came out? Or was moving the machine harder? Those point to different questions, even though any of them might be described as “struggling.”
For weak discharge with a normal-sounding engine, explain that the engine kept running as usual. Compare the latest use with one where it cleared well, using observations you already have.
Check the limits before expecting more from it
Use the manufacturer’s operating limits for your model. Don’t assume a service appointment will make it suitable for every snow depth or condition.
If you ask a provider about the change, give them the model, the conditions and the behavior together. They can discuss whether it needs assessment without treating difficult snow as proof of a broken part.
The technical and safety advice in this draft still needs to be checked against the manufacturer’s instructions by a qualified reviewer. Follow your machine’s manual.
About the review process