We took her to the Vet. He took her blood pressure, which was OK. We knew from previous tests that there wasn't an obvious cause.
As expected, the tablet dose has had to go back up. She's now back to half a tablet twice a day. Last time she was on this, she spent most of her time lying around.
Today I found her lolling around in a planter. This might have been because it was hot, the soil was warm, and she does like to lie in warm soil.
