Rolling mouse, dead boa connected?

[toddnbecka]

A few weeks ago I picked up 1m/3f white mice to breed feeders for my baby corn and carpet python. Found one of the females today rolling over and over in one spot, apparently unable to walk or move normally. I picked her up with tongs and euthenized her, then sterilized the tongs as a general precaution. Any clue what would cause this? Ever seen anything like it before?
Aside from the delay in having a steady supply of mice if I need to start over with fresh stock, our baby boa constrictor died last week. When Becka came home from work she found him rolling and convulsing, and now I'm wondering of it was the same thing that hit the mouse? A week earlier the boa seemed fine, then wasn't interested in eating on the usual feeding day or a couple days later. I didn't think too much of that after reading so many posts about snakes in general occasionally not eating, certainly had no clue he would die in a couple more days.