New .dat file, update motherboard drivers, particularly if using propriatary drivers the BUS drivers and SATA control drivers. Also update your Network control drivers if you can do that individually. Most motherboard drivers include all of the above as a package.
This is caused via a communication issue with the HDD and the HDD controller. Parts can be lost. If the issue is static, the same result will come out each time (the white boxes) When the write/read processes are complete, it corrupts the .dat file each and every time. As for the jumping NPCs... either that is the same issue or the network traffic controller is screwing with the packets. I lose all expertise when it comes to packet protocols, so I don't want to go there. But if packets are getting screwed up as they travel through the network controller or are processed via the BUS drivers, you will see this type of issue. Just do as I recommended and see what comes of it. If that doesn't work, try flashing over a new motherboard BIOS as well. The BIOS controllers may have some type of issue (there are literally billions of issues that can come from a BIOS problem)
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