Normand

The only thing that is common with both issue is the electrical wiring of your house. The only way you can get a 110 voltage from the tool body with a ground is a miswiring of your electrical outlet. I assume the electrical outlet is wired in reverse polarity. This mean the white and black wires are reverse on the outlet. in Canada, you have generally two or three wires with a bare copper wire for ground. In the case of two wires, you have a white (neutral) and a black Insulated wire (live wire) plus the ground. The white does not bear current. The black does. In that configuration, the neutral (white) should not show a difference of potential or voltage with the ground. If this is not the case, the wires are wrongly connected from the electrical panel. You should only read 110 volt between the black and the white or with the black and the ground. Normally the neutral or a valid ground is connected with the chassIs of the tool so you will not feel any voltage when you touch the tool body, even when the tool becomes defective... When the outlet polarity is reversed, this means you now can have a live wire connected with the tool chassis. This becomes an issue. I would recommend you have a certified electrician to check all your electrical outlets for correct polarity as I am sure the problems comes from there. One other option is to buy a polarity tester at a local hardware store and test them yourself. Then have an electrician to fix the bad ones