This issue has been added to the tracker:
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Ran a long time and timed out on connections but does show where it failed on copies
OK, if you do not mind, one more time...
Thanks. It behaves really strange. It seems that accessing the affected file fails only once. When trying the same operation immediately after, it succeeds.
I'm sending you yet another build to confirm this.
Please one more time.
Thanks. I'm sending you a new debug build.
Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.