More than interesting behavior. Help needed please.

[zunex95]

Hi people!
I've started mining about 2 months ago. Everything was fine until this week. Somehow I'm not getting paid sometimes. Usually from 9 am to 6 pm. At night everything is fine, up and running. I've got 2 Sapphire 280x that I'm mining with. The cards are working (i can hear it) according to cgminer and the pool I'm mining on. I'm just not getting paid for some reason in the mentioned times. Tried different pools, different coins, even different cgminers.

Any help would be awesome.
Have a good day, Zunex

[DrG]

Is the miner submitting shares?  I discovered a windows bug where if you have the same username on 2 machines on a LAN some pools won't count your shares.