Somethings going on with my herbs....and it's not good

My herb pot that has thyme, oregano, parsley and garlic chives were doing really well until I noticed that the leaves were getting spots on them. So, the first think I did was chop off all the discolored leave knowing that the herbs will easily grow back. It seemed to work for a bit, but now that the herbs are getting fuller, the spots came back. I'm suspecting it's a type of plant disease. yuck! I'm going to try again and hack the herbs down, fertilize with more of worm compost and cross my fingers.

Any suggestions on how to alleviate this problem?

Herbs

This tiny little pot comes with quite a few herbs. I have from the top, going clockwise, parsley, oregano, thyme, sage, and then oregano again. 

Oregano

Sage

 

Mint

Bay Laurel tree

I've had this for a couple years now. The Bay Laurel is a slow grower, so it can stay in this pot for a while longer. The leaves are great for making soups and stocks!