4K will make one continuous file in a SDXC card (it will break it up in a SDHC card), but if you record 1080p MP4 it breaks it up into 4GB files regardless of what card is used. This is mentioned in the advanced manual.Before you freak out, try a different card. I've been shooting 4k video at 30fps in a GX85 with no problems. I get one continuous file, no matter how long the camera is running.
SanDisk 128GB Extreme PRO UHS-I SDXC Memory Card (V30)
Transcend 128GB UHS-1 SDXC Memory Card (Speed Class 3)
- UHS-I/V30/U3/Class 10
I forgot to check that given the mention of the 128GB card (which for sure is a SDXC).
Anyways, the tip about spanning is still going to be useful for 1080p files shot in MP4 or if a SDHC card is used for 4K.
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