I have an ls1043ARDB and am just getting started to get some Linux with a recent kernel (4.14+) running on it. I started off with LSDK1809 and the Ubuntu rfs + 4.14.47 kernel keeps rebooting every 10min. I have tried several other modern kernels in the same rfs, a few different 4.14 and a 4.19. In all of them the system reboots after pretty much exactly 10min, if not interacted with. With an open ssh i sometimes see more.
4.1 ran for several days on that rfs, and also in an rfs from an older SDK (yocto morty based)