I too have had problems with the vacuum turning on intermittently without pushing the trigger and in some cases will not turn off when you release the trigger. After disassembling the head unit I discovered that the plastic tab inside the handle that the back battery screw screws into was broken, this allows the battery to move ever so slightly. The red trigger button is simply a lever to push a button built into the battery, when the battery moves down ever so slightly it does not allow the trigger to reach the built-in on off button on the battery. This is an incredibly poor design as all it would probably take is one fall of the vacuum to break that small plastic tab inside the handle. If you're able to turn on your vacuum by simply putting downward pressure on the battery or cannot turn the vacuum off unless you press the battery up into the handle this broken internal tab is most likely the problem.
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I too have had problems with the vacuum turning on intermittently without pushing the trigger and in some cases will not turn off when you release the trigger. After disassembling the head unit I discovered that the plastic tab inside the handle that the back battery screw, screws into was broken. This allows the battery to move ever so slightly up and down within the handle. The red trigger button is simply a lever to push a button built into the battery, when the battery is able to move downward ever so slightly it does not allow the trigger to reach the built-in on off button on the battery. This is an incredibly poor design as all it would probably take is one fall of the vacuum to break that small plastic tab inside the handle. If you're able to turn on your vacuum by simply putting downward pressure on the battery or cannot turn the vacuum off unless you press the battery up into the handle this broken internal tab is most likely the problem.
I too have had problems with the vacuum turning on intermittently without pushing the trigger and in some cases will not turn off when you release the trigger. After disassembling the head unit I discovered that the plastic tab inside the handle that the back battery screw screws into was broken, this allows the battery to move ever so slightly. The red trigger button is simply a lever to push a button built into the battery, when the battery moves down ever so slightly it does not allow the trigger to reach the built-in on off button on the battery. This is an incredibly poor design as all it would probably take is one fall of the vacuum to break that small plastic tab inside the handle. If you're able to turn on your vacuum by simply putting downward pressure on the battery or cannot turn the vacuum off unless you press the battery up into the handle this broken internal tab is most likely the problem.