Apologies to Wingmen

Hi Luigi,

Please don't be too concerned about this.  Sometimes these things are unavoidable.  If people just decide to turn off a machine without bothering to abort outstanding tasks first, that's a rather more thoughtless action.
Your 'in progress' tasks will all expire over the next 10 days or so, and will immediately be sent out again.  Those affected wont have to wait too much longer.  :-).   With Einstein, you don't need to keep quite so large a cache of work as it's quite rare for the project to have a significant outage.

When you replace the PSU (if it turns out to be the problem), take care to choose a unit that can cope with the stress of crunching.  It's worthwhile doing a bit of research on what others have found to be good and capable supplies that have a high efficiency and a decent manufacturer warranty.  There are a number of websites around that provide extensive reviews of lots of different brands/models.  The most important spec is the rated power output at 12volts.  The other voltages are largely irrelevant these days.   For example, if you were choosing a 500 watt supply, you would want to see at least 450 watts (~38 amps) available at 12 volts.

What was the rating of your previous supply?