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Assuming you've cleaned or replaced the two removal filters, and changed the battery?
Our V6 battery became shite and would just stop due to lack of power on occasion, bought a replacement larger capacity OEM battery, which came with replacement filters, gave it a deep clean, and it works pretty much better than new.
We got a new V11 which is excellent, and designed better, but still have the V6 as a spare.
We're replacing a >5 year old Dyson V6 which has recently become garbage, battery doesnt last a full house, motor smells like burning when doing our carpets, and it gets blocked every few minutes on carpet/rugs so you have to unblock it with a skewer constantly