The computer is plugged in 24/7 and shows no signs of any problems at all.
You raise a good point. Now that I think about it, I bet most of the people who have had these problems were very "mobile" in that they are constantly wrapping up and unwrapping their adaptors and thereby fraying/damaging them in some way, and eventually having problems. Just take care of your cords and adaptors, and like ANY piece of machinery or technology you should do periodic inspections.
Cheers!