My 2017 Pro4X has been a nightmare from the start. I too had a Frontier previously, a 2006, and that was an excellent truck, but Nissan's quality/reliability have fallen dramatically since the Renault acquisition. I will be selling my Frontier next year and replacing it with a Tacoma. The Tacoma is certainly a bit overpriced, but it's definitely a reliable truck with excellent residual value, so I think it's worth it.Dang, sounds like you're having a lot of problems. Hopefully this is all I have to deal with. I love the truck so far. Tacoma was the only other truck I'd buy and it was way out of my price range. I had a frontier before and loved it.