Happened to me once, I think you'd need to improve the memory for the 70B model since it requires significantly more GPU memory than the 8B model.

FYI Your RTX 3060 Ti has only 8 GB of VRAM, and the log indicates that only 10 layers of the 70B model are offloaded to the GPU, hence the rest run on the CPU.. Your options are switching to a GPU with bigger RAM or using a smaller model.