PopOS does have an automatic brightness feature. It should adjust the brightness based on the available light and from what I could tell from this other forum post it seems to work OOTB.
As for your wireless issue, you can get a utility called iwevent that will give you some better insight into what the wireless interface is doing when it disconnects. You could also try some of the basic troubleshooting steps mentioned in this System76 troubleshooting article, which also mentions iwevent. You would probably more interested in the Useful Commands section of the article.