Are you running Mturk Suite and HitFinder or something similar? If so, double check your settings. I've accidentally changed things before and caused it to stop collecting how I wanted.
I am using Hit Finder with Mturk suite. I just recently started using this, I used to use hit scraper (never got much out of that either).
Here are my settings:
Scan Delay: 5
Min Reward: .02
Min Avail: 2
Min TO: 2.5
Size: 100
Sort By: Latest
What I have been doing is watching hit finder for batches and maybe some surveys that come through the filter, while waiting to find something good there, I watch this website for surveys or maybe run hit scraper for surveys until I find a good batch.
It's just so frustrating it make me want to quit.