Other responses have this pretty well covered... but one more thought to add.
Major new releases are almost guaranteed to be less stable than a well patched and mature, previous major release. In other words, release 10.5.1 being less stable than 10.4.11 is no big surprise at all. It is expected.
Not that this thought is of any help to you. It just jumped to mind after reading the title of this thread. I hope the problems are solved soon and good luck.
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