I’ve also recently noticed that if I leave the case and grid on (and walk away for a bit), I sometimes come back to a frozen grid. Normally, I would power off the case and wait a bit before powering back on, but the last time It froze I hit a few buttons, walked away for a few min., came back, and the grid was functioning again. It was as if the grid/earthsea was stuck in some long, drawn out, slow-down animation that needed to run it’s course before resolving itself and returning to normal operation.