Ok, please do not try this without checking it out first. Here is my story. I had this problem more then once. The first time I got these crawly threadlike things in my soil (ie. Last summer), I ended up throwing out my Thanksgiving Cactus. So last November, I purchased a few more Thanksgiving Cactus from the supermarket. I noticed those pesky tiny fruit flies/knats flying around my plants. ( they usually lay their eggs in the soil ) Well that was it! I mixed a combo of rubbing alcohol and water and sprayed the surface of the dirt on my newly purchased plants really well. I have knat/fruit fly traps all over...ie.. Near each plant. For the first time since the Fall, I recently saw the first little bugger and put out my traps. I may do my alcohol/ water spray again. But this is risky. It did not kill my plants, but it can kill them if you overdo this. Proceed at your own risk. Best to try to control this problem. I do not think you can completely avoid it if you have live plants in the home. They LOVE organic soil and there may be unhatched eggs in the organic soil you buy at the garden center to transplant your thanksgiving cactus into a new pot in the Spring. So far I have NOT transplanted anything. Nor have I fertilized anything. These tiny fruit flies/knats come in through screens or with your groceries/fruit that you buy at your local supermarket. They can even come up out of the drain in your sink! I have added photos of these traps. They work well so far for me. You can purchase them at Home Depot or True Value Hardware.

....the little black "dots" you see are their fecal matter. Whenever you DONT see cats this is a good indicator. Sorry don't know your specific creature, but as Jean suggested and if it were me, I would be out there with a soapy bucket of water and dropping every one I could find. But before you kill them all, I would take one to the local county extension office and see about a positive ID. Vera

I could get this down to 100 or so species by noting it is one of the broad-nosed weevils (most other weevils have a very slender snout) and the pale fringe of hairs around the wings. https://bugguide.net/node/view/860332/bgimage https://bugguide.net/node/view/1136311/bgimage ^^some examples in genus Naupuctus, commonly called white-fringed broad-nosed weevils.

For the top image of the buprestid beetle, I prefer Acmaeodera ornata, note that it has been observed in the Carolinas whereas the more finely-spotted A. ornatoides has only been observed in Texas.