If you are certain no blockages ? and the dust collector is clear/clean ? have you checked that the outlet filter which is located inside dust compartment is clean/clear this is usually a gauze filter its purpose is - as vac works and draws dust into collector the air that is sucked up thro vac builds up in collector chamber or bag on most vacs? and so for vac to maintain suction the air has to be able to escape to atmosphere/room without dust which is left insude chamber/bag if fitted and so air escapes via the gauze vent as prev mentioned ? however if gauze filter is not clear to vent then vacuuum is restricted due to air drawn being unable to expel sometimes on vacs they will eventually cut off due to o/heat but will operate when cooled so may i suggest checking the above possibility ?
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If you are certain no blockages ? and the dust collector is clear/clean ? have you checked that the outlet filter which is located inside dust compartment is clean/clear this is usually a gauze filter its purpose is - as vac works and draws dust into collector the air that is sucked up thro vac builds up in collector chamber or bag on most vacs? and so for vac to maintain suction the air has to be able to escape to atmosphere/room without dust which is left insude chamber/bag if fitted and so air escapes via the gauze vent as prev mentioned ? however if gauze filter is not clear to vent then vacuuum is restricted due to air drawn being unable to expel sometimes on vacs they will eventually cut off due to o/heat but will operate when cooled so may i suggest checking the above possibility ?