Your best bet is searching for the problem you're having first. This is a VERY commonly answered question.
Second best bet is asking and making sure you're doing things right before assuming it's a bug by posting in the How Do I? section.
Now, you're checking way too often. You only need to check every 30-50 tiles for clay as nodes are large. Read up on it here:
http://ringofbrodgar.com/wiki/Clay. Nodes are relatively good sized, which is why you only need to check a few spots per mini map. If you're getting only one at a time, you're not on a node and so need to go farther.
Opinions expressed in this statement are the authors alone and in no way reflect on the game development values of the actual developers.