I'm having the exact same issue with the pink bands on the photos. It looks identical to the OP's photos. Been trying to figure this out for a couple months now. When I get a pink one, I can delete it from the harddrive, then transfer it again from the SD card back to the harddrive, then back to LR and it will won't be pink. Sometimes takes a couple attempts.
It seems to really happen when shooting at high frame rates, and also when hitting the buffer for the card.
This happens with three K'3s and 6 San Disk Extereme Cards 95MB/s.
All 3 cameras and 6 cards were purchased at different times from 2 different sellers, so I don't want to think that the camera is at fault. Cards were purchased in pairs. 4 of the cards are less than 2 months old, and 2 of those 4 have only ever been used for around 1000 photos each. If replacing them is the solution, then using something other than San Disk cards are also the solution.
Here's everything I have tried and consistently get pink photos:
2 different versions of LR.
2 different card readers, as well as connecting the camera up to the USB3.0 port.
2 different graphics cards.
Different monitor calibration profiles.
When I transfer photos, I drag and drop from the card to an external drive. I have tested this between 2 different external drives (same brand of drive, different model). Same results.
Everything I read says not to format a camera card in the PC. I have only ever formated them through the cameras. Mine have never been formated in the PC. Do I attempt to format them in the PC,
and if so which File system (NTFS or FAT) and which allocation size?
Edit: Found instructions.
Formatting a Memory Card - Why, When, and How