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I have had a 2015 F150 since the fall of 2015. One or twice within the first month I had it I got in to start it, turned the key, and nothing. This happened a few times. But if I turn it again, or maybe a 3rd time, it starts. Sometimes, if I keep the key turned, it starts. Sometimes after I left go and the key returns to run, it starts.
It stopped doing this for a couple of years. It is now back to the same thing. Has happened three times in the past week.
Sure .... when the truck is new if you have a 5lb weight on your keychain that could be something to make it fail when still very new????
OP ... I have had the same issue on my 2016. First time was when I had just purchased the truck, 6mo old and 6K on clock. I was parked in a dark garage during the day, turned on an overhead light, and maybe it didn't get turned off since truck was new to me still. When I came back from a hour and half lunch I got what you are talking about. The interior lights are LED, so there should not have been much of a drain. It still happens, I think most of the time is when I don't yank the radar detector plug since the Accessories on my other vehicles turn off when I exit the vehicle after turning motor off and stay on for the F150, I don't always remember. To me it is the truck scolding me for those power drains .... I am sure one day it will happen, but I get battery load tested every year and it is good.
I know there were other threads here discussing the same thing to no better info that the worn switch .... I think I got that one a few years ago when I was sure I stated like you that it started when the truck was in it's first few months of use.
When I first go the truck, the only key on the keyring was the single truck key for a few months, so it's not a weight issue.
Seems to be a bad connection that sometimes connects and sometimes does not.
Might still just be a defective switch. Sure, hanging a bunch of extra weight can cause a good switch to go bad, but a bad switch can do it all by itself.
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Sort of reminds me of a Jeep Cherokee we had years ago. We owned it for about 5 years, and once every 6-9 months it would fail to start. Several times, we had it towed into the shop. When it got there, it would work perfectly. Finally, about 3 months before we sold it, we took it into a shop that was renowned for finding difficult problems. They had an ace technician who diagnosed it down to a worn gear on the ignition switch assembly.
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