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This occurs when the air is dry. The vacuum builds up a static charge when running. If you touch something metallic, you will get shocked. To dissipate the charge on your body, run your hand along a wall - it helps to reduce the shocks.
Hi Elizabeth.It depends how old the machine is and how much work it has done.It could be the motor needs replacing and most good vac repair shops can do this for you.Hope you get it sorted.
You could contact Numatic technical on 01460 68600