Static in earbuds while walking/running?

4s. having random frequent pops , clicks coming through earbuds-3 different kinds-while iphone in front pocket , walking , or running. happens case, without, etc. doesn't happen if hold in hand , it's not cable coming out of socket. static caused movement near cloth?

 

i have noticed while in pocket stress headphone jack while in socket cause static , 1 or both phones losing sound until pressure released. has happened on of iphones think stress around jack connection.

 

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