Euphorbia, Martin's Spurge, Wood Spurge 'Tiny Tim'

We planted the Tiny Tim 2 years ago. It is doing very well, but what we are experiencing are flies. There are always flies on this plant<...Read Morebr /> and we can't get rid of them. Is there anyone else that has this problem with the Tiny Tim?
We are actually thinking about digging them up.

I planted 3 of these a few years ago. They were well behaved, grew in a small roundish form, bloomed nicely with interesting blooms. They...Read More were a little bigger the second year and seemed to be doing fine...but then two of them seemed to go"doing fine" to dead in a short period of time.
Now this spring the last one greened out like all was well..but now it is turning brown and dying too. I am wondering if this is just a short lived perennial.