problem with connecting

Hi guys!
Last 2 month i have problem with connecting my own miners to the pool - miners didnt get a work.
I use SilverFish miners, and they run and control under his software - SFLMiner. i try 2 version: 2.1 and 3.0.
If connecting happens and miners get a job - all work fine for day or week. but if connect lose i have problem:
workers show on stasistic, but stay in stasus testing. and miners just stay with no work
restart SFLminer didnt help. I try many arguments in password field - but nothing help.
my login on the pool - vitamin
Can you help me?

Thanks for the report. This is something that Chris is best with. I'll make sure he reads this when he gets up in a few hours, and we'll get back to you later today.

I'd be glad to help. Can you tell me exactly what you are putting in the username and password fields? I think that you may need to use a static work restart interval since some mining software gets hung up with the low difficulty shares we use for work restart testing.

Thank for help, guys.
I try a static interval and that help. Now all work fine