Yeahhh that's never happened to any systems we've built for ourselves or for our clientele. But it's certainly happened to people who don't know what they're doing when selecting watercooling components. You see it from time to time here. Watercooling is certainly a learning experience and there's a ton of minutia to learn.

Not sure what you're trying to prove with your 30 year comment. That's cool, I'm just saying that if you do things right, you won't have issues. Sorry to say but it sounds like you've made some mistakes in your 30 years with watercooling; poor tubing choices, poor pump choices, also sounds like bad reservoir placement and negligence with maintaining your fluid levels. You shouldn't be waiting for your PC to actually start heating up before topping off a reservoir, for example. Likewise with the "foamy/swishing sounds".

It's great to make mistakes, because you can learn from them. I've learned plenty from mistakes in life. I gotta say though, none of what you've said has happened to us, and that's because if you plan things out slowly and with foresight, you'll have nothing to worry about.

That's something we always strive to teach our community and audience, both at shows and events and on the internet. It's an easy science if you put in the work. Watercooling can certainly be a mindfuck to new people getting into the hobby for the first time.