I messed with it tonight. They open and close 4-5 times just fine, then when it feels like it, the passenger door won't close. As soon as I touch the relay switch and basically push on the lever to make sure it's all the way over, the passenger door shuts. Then repeats the process, works fine 4-5 more times and.....
It's almost like the switch works it's way towards the default open side just a little bit, enough to keep the passenger door from closing. I'll keep working with it a bit and pull it off this weekend, clean it, lube it etc...and just keep an eye on how it acts. If it continues, then I'll have to replace it.