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I don't know how to edit my original post, so I am replying to myself! LOLI love LR forums! Being able to chat with other LR owners is priceless. Thank you for starting this thread and sharing your intermittent stalling experience.
I have a similar problem with my 2014 LR4 SCV6, although there doesn't seem to be a link to the weather conditions. The first stall occurred 6 weeks ago. It didn't happen again for 2,000 miles, then twice in one day. It stalled while driving and a few times on start-up but has always restarted after 1-2 tries. The fault codes were P064A-38 and P025C-11 (both electrical issues related to the fuel pump control module). Based on this thread, I jumped straight to the relay as a possible culprit and replaced it. It's been just a week but so far, so good. Sadly, driving it and wondering "will it or won't it" is has dampened my enthusiasm for the beast!! (I've started to miss my 4Runner) Fingers crossed.