I've cleaned the roller, filters, and motor assembly, but my Dyson DC25 smells like burning rubber and overheats quickly. What could be the issue?

After cleaning the roller, filters, and motor assembly, if your Dyson DC25 vacuum cleaner still smells like burning rubber and overheats, here are some potential causes:

Blocked Airflow Hose: Inspect the airflow hose for obstructions as they may prevent cooling and cause overheating.

A worn or defective belt may be the root of the problem, so check it carefully for damage.

Overheating may occur if a motor is faulty, which can cause it to run improperly. If other parts are in good shape, replacing the motor might be necessary. When using the vacuum, make sure you have enough ventilation. During prolonged use, take breaks to let the vacuum cool.
Regular upkeep and addressing these potential problems can help solve the issue and maintain the functionality of your Dyson vacuum.
Whatever the case may be, it's always a good idea to consult a technician or authorized service.