Hi Try this, it worked for my wifes 5505 after Dell tech had tried and failed. Go to 'Device Manager' and find your network adapter. Open the Properties dialog and select the 'Power Management' tab. Uncheck the 'Allow the computer to turn off this device to save power' check box, then click OK. You will probably need to reboot.  
I have the latest Dell Inspiron 5000 and I recently updated the software to Windows 11. The issue happens whenever my laptop goes to sleep mode. After I open my laptop from sleep, there are 2 main problems I faced. 1. The internet connection is not showing. The wifi option is not there. To retrieve this connection and the wifi button option is ONLY by restarting the laptop. I have tried resetting the network, troubleshoot, update the wireless adapters but the problem persists.  2. All the opened windows are closed upon waking up from sleep mode. There are no options for setting Hybrid sleep. I would appreciate it if anyone can offer me help or suggestions apart from all the things I have tried. Thank you!
Sleep issue Windows 11 (Wifi & Closed windows) - Dell Inspiron