@jimski: Yes, I'm sure about this. It's really easy for me to reproduce. Happens like clockwork. I like to try new apps from the marketplace pretty often, and every time I download one that uses background tasks (to get to a total of 22) they all stop working. I uninstall something from the list and they all start working again. Happens every time. I'm fully convinced that it's an OS bug, albeit an obscure one. BTW, I'm not saying that 22 is the number for everyone. As femanuele said the "limit" for his/her phone is 14, so it's very possible that this is different for everyone.
And regarding the endpoints, I wasn't necessarily suggesting that it's somehow caused by issues with the registry, just that it kind of reminds me of that old issue.
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