Turbo failure & Weak Engine Break

KW T660 2012 A few years ago my turbo and actuator failed but I quickly repaired it. I thought it would solve the problem but soon after turbo/actuator failed again and engine brake went weak. I went through many mechanics, replaced parts about 4 times that year and all mechanics told me the same thing, to keep replacing turbo/actuator. Every time I would replace parts my truck went back to running back to normal for about 6 months and then again turbo/engine brake failure. I especially noticed the turbo failure after not running my truck for a week; as soon as I would turn it back on from taking a vacation I had turbo failure. At this point I’ve exhausted all my options, I’ve spent so much money and it’s not worth repairing anymore but I’m wondering if this has happened to anyone else? My truck has a delete and I’m thinking it might be a computer problem but no certified kenworth mechanic will work on it because it’s been deleted.