Oh dear. What did the $4k get you? A new OBC only, or other things?
I'm booked into a local garage for Monday. (Not the Kia garage, but we can always take it there if need be.)
Someone posted a link to an American service bulletin https://static.nhtsa.gov/odi/tsbs/2017/ ... 8-9999.pdf
about a batch of OBCs that was deemed to be faulty, but if my car has its original OBC (the car is second hand, so I don't know) then mine must predate this. My car was first registered/taxed in the UK in October 2014, and this bulletin (if it can even be applied to UK cars) refers to MY 2016, manufactured in 2015.
I'm going to hope for a miracle, that some software/firmware/cheap part will sort it! We'll see.