Bear in mind the moment it starts, it's assuming you're going to drive away, and it'll warm up as required. However, if you don't, the moment the engine is switched off, you will still have fuel in the manifold/ on the back of the valves, or even in the combustion chamber, awaiting to be burnt. During the summer, this isn't a problem, it'll evaporate.
During the winter (but more-so during spring and autumn when the night temps are low and days are warmer) it can't evaporate, and borewash may occur, or, in the event of another cold start, more fuel is now injected onto the already fueled system. Hence the flooding issue.
I think this is exacerbated by the electronic throttle systems not allowing you to open the throttle fully to clear the flood, when restarting......
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