yes, it can be a big problem...meat has its own preservative in it, it can only be frozen once while raw...after it thaws, you can cook it, then re-freeze it, but ya cant refreeze raw meat.
now, if you take extra pre-cautions, and not let the meat really thaw out all the way, and run ice along with the meat and spices through the grinder, it is possible. personally, i dont take the risk, rather do it all when i 1st process the deer, and i guess if i didnt, i would just cook the sausage, then freeze it. gl