Every week or 2, he loses his wallet only to find it hours or days later. He loses it for good every few months. Last 2 months, he lost and replaced his keys 3 times. He loses items of lesser importance every few days. He lost money because of carelessness like not giving a 30 day notice to cancel wifi because he didn't know. He did this with his lease agreement too and lost the deposit. If something's not working (like a website or machine), he doesn't troubleshoot, he tries the same thing until I notice and help. He breaks things because of misuse.
He does something that I feel is foolish almost daily. I advise him with solutions but he hasn't learned to use the same methods on his own. I can't understand why he doesn't see even the simplest 1-second solutions.
My close friend said I'm exceptionally self-sufficient and good at problem solving, so I might have high expectations. I tried to lower my expectations but his level of problem solving is to the point where I feel he lacks common sense. I tell myself everyone's good at different things and his behavior doesn't mean he's lacking in intelligence. He is a great athlete and knowledgeable in his field, plays many musical instruments, so I know he isn't dumb. But I dont know how to stop feeling this way whenever I see his behavior. I dont know how to adjust or talk to him about this issue w/o hurting his feelings.