I have a strange patch on my lawn

I have a strange thing happening in my lawn. I noticed a small patch of something weird and scooped it out. I found a couple of small yellowy, orange, wormy things in the soil. A bit like skinny cockchaffers. There was also a lot of white patches. Anyway, I scrapped it all out but a few weeks later, the patch looked all slimy and there were more white patches. Yuk. I scraped it all out again. A few days later, it’s looking strange again. Here are some pics. Any idea on what is wrong and how I can fix it?