Have a bit of an annoying issue with USI-LS and I wanted to see if anyone else had hit it and had a workaround for it. Capsule summary is "EC always decreases when craft not in focus".
All of my manned craft, when they're not in focus, have their EC timer steadily dropping to 0 even though they all have nuclear reactors active and at least one solar panel attached. When the timers hit 0 while out of focus, the recyclers, science labs, etc. shut down and supply consumption spikes. As soon as I focus the craft, EC jumps right back up to its maximum value of ~16 days, only to start running down again as soon as I unfocus. The upshot is that every single manned mission needs to be briefly focused every 15 days or so, which is extremely irritating when talking about multi-year missions to other planets. This issue https://github.com/BobPalmer/USI-LS/issues/129 (#129, closed 30 days ago if the link doesn't show up) seems to indicate that this is WAD and not a bug, which is... unfortunate, though I guess it isn't actually a gamebreaking bug. Is there any way to work around this? Right now I'm considering just setting it so that nothing happens when a kerbal runs out of supplies, and only using USI-LS as a guide to how much I need to build while constructing a vessel and then completely ignoring it which seems a bit strange!
edit: I think the nuclear reactor I'm using (From the USI core tools package) is shutting down when unfocused. It also sometimes shuts down for no clear reason when focused, despite not overheating. Basically I should probably just give up on these reactors and install one of the mods that makes you have some agonizingly complicated resource chain to get 1 EC/s reactors. I loved the USI ones last time I used them a few versions ago, because they were simple and just worked all the time... like USI-LS!
