I lost flash sunday, but up to the end of march I had put them all out during that warm spell at the warmest part of the day for 3 days, they have been in ever since then and on fleece. It was a shock as up till the previous sunday there were no symptoms or indication of a problem till he just stopped eating, fluffed himself up and sat in the corner, took him to the vets, got the treatment but he never improved (never got worse till sunday evening when he died either), just stayed the same. The girls are all fine.
I do wonder knowing a little history to flash's stay in the rescue and this is no comment on their care or anything like that, he had a spout of illness and lost weight, took a few months to put it back on and then was ready for adoption so I wonder if there was something underlying in him already that was triggered in the past week or so. He was a small boar, never podgy like fudge is but not a runt.
This time last year I had them out on grass already but only on warm and dry days, they were in a hutch then, I have not put them back out in the hutch yet as its a lot colder than last year still and they have been in a centrally heated house so not fair on them. I was cutting grass for them everyday as I am now so nothing bar their home location is different.
I doubt there is a connection, just coincidence as its all been different things that has taken our pigs from us.