Just wondering if anyone else has experienced this problem.

I have a Alpine CDA-9857, and the Alpine KCE-422i ipod adaptor set up, and its been working great for about 6 months. Recently, Ive had problems with channels one and three in car going dead (The left side of the car). So I checked the connections, amp, and headunit, they're all good. Then for the next week, channels 1 and 3 would cut on and off. So I figured it was the amp since they would cut out in unison. Switched out the amp, still happened. Figured it was the headunit, had Alpine look over it, no problem. So I got the headunit back last week and the problem started happening again. Then as I grabbed the ipod in frustration, I heard a noise that made me realize its the connection between the actual ipod and the KCE-422i. Unless I keep pressure on the connection, half the signal is lost. Has anyone else experienced this problem?