<p>Follow these steps on the Windows 11 PC that has the issue.</p>
<ol>
<li>
<p><strong>Run the built-in Network troubleshooter</strong></p>
<ul>
<li>On Windows 11, run the automated Network and Internet troubleshooter in the Get Help app. It will run diagnostics and attempt to fix common connectivity issues.</li>
</ul>
</li>
<li>
<p><strong>Check if the wireless adapter is detected and enabled</strong></p>
<ul>
<li>Select <strong>Search</strong> on the taskbar, type <strong>device manager</strong>, and open <strong>Device Manager</strong>.</li>
<li>Expand <strong>Network adapters</strong>.</li>
<li>If the wireless adapter is listed but has a down arrow, press and hold (or right-click) it and select <strong>Enable device</strong>.</li>
<li>If it is not listed at all, Windows is not detecting it. In that case, a driver must be manually installed from the device manufacturer’s website using another PC and a USB drive.</li>
</ul>
</li>
<li>
<p><strong>Verify the driver status and version</strong></p>
<ul>
<li>In <strong>Device Manager</strong>, expand <strong>Network adapters</strong>.</li>
<li>Press and hold (or right-click) the wireless adapter, select <strong>Properties</strong>, then the <strong>Driver</strong> tab.</li>
<li>Check <strong>Driver Version</strong> and <strong>Driver Date</strong> and compare them with the latest version on the Acer support site (from another device). If they do not match, download the correct driver on another PC, copy it to a USB drive, and install it on the affected PC.</li>
</ul>
</li>
<li>
<p><strong>Uninstall and reinstall the wireless adapter driver (with backup driver ready)</strong></p>
<ul>
<li>On another PC with internet, go to the Acer support site for the Aspire A715-51G (Model N22Q3) and download the latest Windows 11 wireless/Wi-Fi driver. Save it to a USB flash drive.</li>
<li>On the affected PC, open <strong>Device Manager</strong> > <strong>Network adapters</strong>.</li>
<li>Press and hold (or right-click) the wireless adapter > <strong>Uninstall device</strong>.</li>
<li>Check <strong>Attempt to remove the driver for this device</strong> > <strong>Uninstall</strong>.</li>
<li>Restart the PC: <strong>Start</strong> > <strong>Power</strong> > <strong>Restart</strong>.</li>
<li>After restart, if Windows does not automatically install a working driver, install the driver from the USB drive that was downloaded from Acer.</li>
</ul>
</li>
<li>
<p><strong>If the adapter still behaves erratically, use Network reset (last resort)</strong></p>
<ul>
<li>Select <strong>Start</strong> > type <strong>settings</strong> > open <strong>Settings</strong> > <strong>Network & internet</strong>.</li>
<li>On Windows 11, select <strong>Advanced network settings</strong> > <strong>Network reset</strong>.</li>
<li>Select <strong>Reset now</strong> > <strong>Yes</strong>.</li>
<li>The PC will restart; Windows will remove and reinstall all network adapters and reset their settings to defaults.</li>
<li>After restart, reconnect to Wi-Fi and test.</li>
</ul>
</li>
</ol>
<p>If, after these steps, the wireless adapter still disappears from Device Manager or cannot maintain a connection while other devices work fine, the issue is likely with the Wi-Fi hardware or a very specific driver problem, and contacting Acer support with the model information is recommended.</p>