Yes I've just been through this process. Exactly the same symptoms.
It will poor electrical connections on the indicator assembly. The colder it gets the longer the delay.
I replaced mine with a second hand unit which cost about $180 including fitting. Apparently it is a bit fiddly but if you know what you're doing there is a technique. That's why I left it to someone else.
This is not an uncommon issue.



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Hopefully there is no strange link between the dark lord Lucas and head gaskets 
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