The final Windows 10 Wireless Drivers package that supported the Advanced-N 6235 adaptors was version 19.70.0. The included driver was version 15.18.0.1. I suggest you try downloading and installing this version, to see whether it corrects the issue.
As you know, Intel has discontinued a lot of the older Wireless adaptors. Being discontinued means that Intel is not providing any support for these adaptors. This also includes not providing any driver packages for download. Luckily, when I saw the discontinuation notice go through, I saved away copies of the final driver release packages in my archive. I currently have a portion of this archive in the cloud and you can download the driver packages (Wireless and Bluetooth) from there. Use this link: https://1drv.ms/f/s!AtacZBU04mo-j-tQ34BdSDv6y1BFsg?e=7gn50T to access my archive. Subfolders provide final driver packages for most of the Discontinued Wireless adapters. In your case, you will want the folder titled "Wireless-N 105, 135, 2230. Ultimate-N 6300 and Advanced-N 6205, 6235".
Hope this helps,
...S
