Last night I tried to roll my rear driver side power window down with the switch in the front. Went down slowly, and then wouldn't come back up (I only put it down a couple of inches). The switch does stick up front, and you have to manually rock it back. This happened one other time, but after hitting the switch a few times it went on up. I tried reaching to the back door and rolling up, but no luck. Could this still be the switch up front causing the problem, or do I likely have a bigger issue?

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Diesels:
1971 Mercedes 220D, auto (W115), 220k mi
1983 Mercedes 240D, auto (W123), 125k mi

Non-Diesels:
2013 Chevrolet Volt - 2300 mi, used 5 gals gas