My verigated spider plant is over a year old. I reported it when I got it and it had lots of roots. Recently it was looking limp and the leaves are thin and losing color so I decided maybe time to repot. I took it out and hardly any roots at all just a few only 1-2" long. I noticed a tiny brown bug the size of a pin head. Could have that bug done this? What kind of bug. I washed the plant with soap and water and planted in a new pot with new soil. I am worried that it could get to my other plants

Where in the USA are you located? Different areas of the country have different pests. Is this strictly a house plant? Or does it spend part of the year outdoors?

Midwest. Strictly house plant. I water it once a week to once every 2 weeks no fertilizer. It doesn't get much natural like but it has been in this location the whole time and didn't look bad until the last month or so. My Hawaiian spider plant in another room looks great.

The bug is not damaging the roots. You didn't provide details or a photo that shows the repotting that you did initially, but that is probably where the problem started. Many folks tend to move plants into pots that are too large and that makes it very easy to inadvertently over water and cause the roots to rot. I don't know if that applies here, but it may.

Spider plants do best when moderately potbound and kept in a sunny window. When properly potted, they normally need water about once per week or more often.