HT Lead keeps popping off

Hi

I am not sure if anyone else experienced this in the past with stock HT leads. I bought a new set of Lucas leads and no 2 from the left (standing at front of the car), keeps popping off the spark plug after a short while. I had a set of pro-spark ones prior and the same happened, but the pop off rate far slower (say after a couple of months).

Has anyone else had similar issues with K11 HT leads, or maybe I haven’t run them correct?
 
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