Joined: Aug 2010
Posts: 12,760
Likes: 2,114
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
I used to suggest buying some tuner cleaner, but have not seen that for sale for years, especially after Radio Shack closed, etc.
You could try a drop of rubbing alcohol on the port and then wiggle the plug in the port a bit. I sometimes use rubbing alcohol to clean my USB ports if they act up.