Look for a copy of the manual, most concentrators have a filter on the intake that's fairly easy to remove and clean.
If its the millennium M 10 the inlet filter is on the left side of the machine, the filter simply gets washed with a mild detergent rinsed, squeezed, and air dry before reinstalling.
The brand/model number should help you find the manual through Google.
It may not fix your issue but its a place to start.
Some other common issues are the machine being to close to the wall/floor causing issues with the motor.
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