Hi,

this here is the old CEP1 forum, have a look at the CEP2 forums, your problem has been discussed there lots of times :)

You might try this:

(1) Make sure to switch LAIM on (leave app in memory while suspended on)
(2) Avoid turning off the computer while there are unfinished CEP2 tasks. Checkpoints are often hours ago.
(3) Don't run CEP2 while running applications with high CPU usage such as gaming. You can run other tasks safely.
(4) If problem persists, reduce the number of simultaneously running CEP2 tasks under "device manager".

Nothing broke. Typically the 3rd job of 16 in a task takes multiple hours before it checkpoints and saves progress, so it was a bit unfortunate you closed down after a few hours [and one of the reasons why CEP2 is made an explicit opt-in science... requiring acquainting with it's particulars]. Hibernating rather than powering down would have preserved the status in memory to disk and resumed the task where it was when powering up. With hibernating, also activate the "Leave application in memory when suspended". This computer feature, mostly used for laptops, does not use power, but does allow for quick resume where the computer and everything else on it left off.

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P.S. To admin, would you please move this to the CEP2 forum.

thx