Is the wireless adapter native to your system (installed by factory) or was it chaneged for the Intel® Dual Band Wireless-N 7260? if it is native, we recommend to use the drivers from the computer manufacturer first even though their latest version may differ from the ones found in our download center.
If after updating the drivers you notice that the issue is istill present, as a second option, you are welcome to try our latest driver (18.33.0) according to your OS version and architecture (32 or 64 BIt). For your convenience, here is the link for our drivers: Drivers & Software
Another important point to check is to confirm if your router/modem is running the latest firmware as well as it may contain improvements implemented by its manufacture.
Please let us know the outcome in order for us to move into the next step.