I would say either 'bad' or 'poor' contact, not connection :)

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Note added at 4 mins (2008-06-22 17:05:42 GMT)
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Poor electrical conductance at switch contacts in electrical devices caused ... often causing poor electrical contact, that is, poor electrical conduction. ...
www.freepatentsonline.com/EP0352341.html

In many instances, the problem resides not with the device, but with poor electrical contact between the power adaptor's conducting or contact tip and the ...
www.patentstorm.us/patents/6290545-description.html

Some of the most perplexing, intermittent problems with radio equipment can be traced to poor electrical contact either with plug-in boards or other types ...
mrtmag.com/mag/radio_electrical_contact_enhancer/

receive reduced current due to poor electrical contact with the. shackle,or low water conductivity.Intermittent electrical con- ...
www.ingentaconnect.com/content/bva/vet/2002/00000151/000000...

etc...etc...