I don't know whether there is a specific solution to the problem
you are describing. Let's see if anybody comes up with one.

But generally everything that relies on the computer browser is
unreliable, so even if you get this to work, a new problem can
crop up any time.

Can you directly navigate to \\PC1\Temp and \\PC2\Temp (after
adjusting computer and share names to the ones you actually
use)? If so, then that is a reasonable workaround that is much
more reliable.

Hans-Georg