So, I assume (I'm no expert) that the free driver amdgpu is the right choice for your card...
I guess it is difficult to find the root cause of those kwin crashes.
For sure, I think you should try the suggested delay (check e.g. this post).
At a quick look at the KDE bug tracker, it seems to me that there are several issues open for kwin but none of them appeared applicable to your case, although some reports generically described those crashes to be quite frequent.
Now that you've narrowed down the issue, maybe next time you can pay more attention and e.g. check the logs to discover something more.
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