I feel a little better now...
At least somebody can judge that I haven't gone completely nuts.
What you discribe, is exactly what I'm experiencing.
After the move my rifle riflle will put pellet on pellet again, I just can't predict when the next jump will happen. And as it happened yesterday at 18-20°C, I was afraid it was only coincedence that the problem first started beginning of winter. If it were the springguides, I think we'd have bad overall precision or V0, but our rifles perform well, just hard to tell where to pellet goes.