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The reason for these problems was an interrupted optimisation run to free unused blocks of the virtual disk by parallels.
The solution is to deactivate the "activate trim" function of the virtual hard disk. I don't know, why this function suddenly causes these...
It seems, that I have the same problem: https://forum.parallels.com/threads/parallels-12-13-reading-xx-gigabytes-and-windows-10-get-stuck.342904/...
Since y few weeks, parallels 13 reading periodically several 10 GB and my virtual windows 10 (version 1709) get stuck. During the reading even the...