After research on fixing trim errors what i found is whenver the trim is unresponsive or not showng quality reslts as you mention in your post. The very esay ways to fix it are:
- Your SSD needs optimization.
- The fiemware driver is out of date
- BIOS driver needs update.
- If all above criterias are OK in your system then i suggest you to please at once go through the Dell Latitude E5430 Manual to find out the root of this issue.