it only stays on for 10 seconds... and turns itself off. help?

I did a complete teardown and cleaning, yet the problem persisted. Then I noticed that the motorized floor brush was spinning intermittently, then the main unit would shut down. Seems that the motor separated from the worm gear. I replaced the motor unit-problem solved.

Old thread but I know the answer. My Dyson V8 symptoms were that it would go on/off, qickly for 7 times in a row and then stop altogether. Release the trigger and it would do the same again.

hi. I just wanted to repeat the answer that worked for me..when I return the vac to the charging stand, and ‘click’ it in, it does NOT start charging and the blue light does not turn on. I have to physically and intentionally push the two pieces together, the blue light turns on, it recharges, and works perfectly. Don’t have to do the series of strange steps, and the battery is fine.