Triple-click selects all the connected things

This might be related to your graphics card.
See this:

Yes I was having this issue before and can confirm having ‘Outliner’ or ‘Model Info’ tabs open on heavy models will prevent triple-click selections (This was pretty frustrating to figure out, having to try many things before this conclusion). This is unfortunate because these are really useful tabs to have open on heavy scene files. I hope something can be fixed for this in the future.

This has been an issue for some time. I MUST have outliner and model info open for all the reasons these existing. This is clearly a bug.

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I created an account to confirm that this fixed it for me. Thank you!

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Thank you! Like @Hertzy3, I too created an account just to say this fix worked for me. Cheers.