We understand you're experiencing frequent disconnections from your legacy 802.11n network ever since updating to the Fall Creators Update (RS3) Windows® 10 build.
As a starting point, please try a driver only clean installation:
1. Download and extract our latest IT Admin driver for your adapter: WiFi_20.10.2_Driver64_Win10.zip
2. Under Programs and Features in the Control Panel or Apps & Features in Windows* Settings, uninstall any instance of the "Intel® PROSet/Wireless Software." When prompted, choose to "discard settings."
3. Go to the Device Manager > Network Adapters > Right click on your Intel(R) Dual Band Wireless-AC 7260 and uninstall it. Make sure to mark the option to "Delete the driver software for this device."
4. Clear out your temporary files: Press the Windows* Key + R to open the run box. Type Cleanmgr.exe and press OK. Here you will need to make sure Temporary Files are checked, you may uncheck everything else and select OK.
5. Go to the Device Manager > Network Adapters > Right click on your Intel(R) Dual Band Wireless-AC 7260 again, this time choose to "Update driver software..." > Select the option to "Locate and install driver software manually." Here you will need to direct the wizard to the location where you extracted the IT Admin package back in step one.
6. Reboot your computer.
After the reboot we can recommend adjusting the following advanced adapter settings:
1. 802.11n channel width:
1. Band 2.4: 20 MHz Only
2. Band 5.2: Auto
2. Roaming Aggressiveness:
1. For home use: 1. Lowest
2. For enterprise environments with multiple APs: Check with your network administrator, keep as low as possible.
3. HT Mode: HT Mode. (VHT Mode enables 802.11ac, HT mode limits your adapter to 802.11n and helps with compatibility for legacy N networks).
If these steps do not resolve the issue, please generate an Intel® System Support Utility report, which will contain more information than the Intel® Driver & Support Assistant report.
1. Download and run the Intel® System Support Utility.
2. Select to scan "everything," and run the scan while connected to your wireless network (if possible).
3. Save the report and attach it to your reply.
Note: To enable attachments, make sure to switch to the advanced editor while replying.
We're glad to have been able to help. Thank you for the confirmation.
If there's anything else we can help you with, feel free to contact us again.