I had a litter about a fortnight ago and now only have 2 out of 8 left all the boys semed very healthy and at around day 4 they just started to go stiff as in dead stiff ,came back to life and then their condition deteriorated until they died. No sign at all that they were sick until the stiff thing.Ive never seen this before.Is anyone any closer to an answer on this? Can I expect this again in my next litter?God it breaks your heart.