Yes it did :-(That's annoying isn't it - will reset your image number too.
Because you can only change the manual ISO settings from the fn button. To change between auto and manual, you HAVE to go menu diving. You MUST. Its REQUIRED! And there are associated settings that need to be taken into account as well, and are easily forgotten leading to much pain and suffering. Err, at least minor inconvenience and perhaps several lost shots before you realize WHY auto-ISO is choosing 3200 for you even in broad daylight. See my longer explanation above, if you feel like wading through it....Why not just use the Fn button to access and change ISO, rather than setting it in the deeper menu?