Well, Fifi has just gone her 6 months and hers is back again, just got back from the vets!
No idea why she gets it , I never go away either , there are no other cats come into the garden as if mine are out so am I or the door/ window is open and I can see them .they can't get out the garden , they don't fight or bother each other , except Winston is in love with Pandora and they are often together .
So , no reason ,except she will not eat wet food ! I have even soaked her biscuits and took the dry ones up , but she has only had a few.