Hello Elliot, gosh too bad for the experience. Its a core issue of how to ensure there is enough power, and then also recover from low power events. However to be able to get some help its best to post the details of the two systems. Need to phrase the problem with enough detail that some one else might be able to comment. Battery size and source, Solar panel wattage and source, Mayfly version and software. I would also suggest the graph of when it was operating well and then when it was drooping. Also of course the aspect of the solar panel. The 5V Solar Panels don’t do very well in shade.