Transients, which are commonly known as surges, are the lighting-fast striking of light. These are caused by high-voltage disruptions in the flow of electricity. They occur for a split second. Transients can damage any electronic devices that are connected at the moment.
If the transients continue happening, it is probably time to get your electrical system connections checked. Otherwise, these transients are nothing to worry about if they have stopped.
Solution
Check if there is anything wrong with your wires and consult with an electrician if the transients keep going on.
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