Oh yes they do, Richard! Well, perhaps just occasionally....
Did something I know not what to my wireless card configuration at Hamburg airport yesterday; it refused to budge from Channel 10 and would not allow me to connect - despite pleas, swearing at it, threatening it with a visit to Dr Dell....
On getting home I had a brandy to get up sufficient courage to try 'System Restore' (having never done it before and only having a vague idea of what it does). A few easy to follow prompts, a few chuckling noises from the HDD and all was pure joy - wall-to-wall and treetop tall connectivity again!
Then had anhotr bnadry to shhhhhhellebratttt.....bad move. Bad!