Not yet, mine had been surprisingly ok compared to other cars I've had. Maybe the lifeshine treatment got onto the lens?
In Japan you can get an official Honda accessory that blows air on the Jazz reversing camera lens to clear away any rain drops. It was about £100 when I looked, hopefully Honda UK will offer it here.
I think the camera rotates when you switch it to downward rear view - I haven't tried it, but maybe that would shake off a few drops?
I've found I leave mine in wide view to see approaching cars/etc from the side but switch it to standard rear view when reversing into a space and getting close as it's easier to line up.