I've got a hoya of some sort too - it was a cutting from my granny's plant when she was alive - every couple of years or so it starts to look ill, and I have to be quick to take cuttings to start to root again - my aunt has this issue with hers too - only ours has smaller leaves and right now, on my one small plant, I have 9 flowers! It's crazy!!
I wish I knew what kind it was.
Your hoya is very nice too.