Hi RP. I"m Greg, an installation specialist, 9 year Windows MVP and Independent Advisor, here to help you.
I'll give you everything possible to try in order of priority so that hopefully something works. If you need help performing any steps I'll be standing by here to guide you:
Enable IPv6 in the network adapter settings:
https://www.tenforums.com/tutorials/90033-enabl...
Run the fixit from
https://support.microsoft.com/help/929852 (Re-enable IPv6 on all nontunnel interfaces) and reboot.
Right click the network icon in System Tray at bottom right end of task bar to Troubleshoot Problems.
Try powering off modem, router and PC and then restarting in that order with 1 minute in between each.
Try all of these steps:
https://support.microsoft.com/en-us/help/10741/...
https://www.kapilarya.com/how-to-reset-network-...
Update your network adapter drivers from the PC maker's Support Downloads web page using the full model number, HP Serial Number or Dell Service Tag on sticker. Compare the latest drivers available for download with the ones presently installed in Device Manager reached by right clicking the Start Menu. Make sure you have the latest BIOS or UEFI firmware, Chipset, Display (Video), Sound, USB3, Bluetooth, Network and all other drivers, or else download and install the latest now.
If you have the latest network driver then try on it's Driver tab also to Roll Back, or Uninstall and then restart PC to reinstall the driver. Try also all older drivers from Update Driver > Browse > Let Me Pick list working backwards.
Go to Settings > Network & Internet > WIfi > Manage Known Networks, highlight and remove the network having problems, restart PC to see if it shows up again.
Try plugging in by ethernet cable to the router to compare, then plug the ethernet cable into the modem (if separate) to see if this might be an issue with the router.
You also are entitled to Support from your internet provider to get online on all devices. This is always included in the monthly bill. If your router is less than a year old they will also Support getting it connected and optimized.
Another option is you could replace the wireless adapter with an inexpensive USB nano adapter like this one:
https://www.amazon.com/dp/B011T5IF06/ref=psdc_1...
if this was caused by Windows Updates then you can check which were installed at Settings>Update & Security>Windows Update under Installed Updates, then uninstall them from the link there, and hide with the Hide Updates tool downloaded from here:
http://download.microsoft.com/download/f/2/2/f2...
You can also use System Restore to get before the problem began, then check for Updates with the Hide Update tool and hide them:
http://home.bt.com/tech-gadgets/computing/how-t...
If this was caused by Version update then you can roll it back in Settings>Update & Security>Recovery and then hide it until it matures using the Hide Updates Tool downloaded from here:
http://download.microsoft.com/download/f/2/2/f2...
Sleep is also always governed by the Display adapter driver so focus on that now to make sure you have one that properly supports sleep:
Update the Display driver from the PC or Display adapter maker's Support Downloads web page for your exact model number, HP Serial Number or Dell Service Tag - from the sticker on the PC.
While there check also for newer chipset, BIOS/UEFI firmware (very important), network, sound, USB3 and other drivers, comparing to the ones presently installed in Device Manager reached by right clicking the Start Menu.
if this doesn't give you the latest or ideal driver for what you need, compare it to the driver offered by the Intel driver update Utility here:
http://www.intel.com/content/www/us/en/support/...
or the Nvidia Update utility here:
http://www.nvidia.com/Download/Scan.aspx?lang=e...
or the AMD autodect utility here:
http://support.amd.com/us/gpudownload/windows/P...
For Display issues one fix that is working is to Roll back or Uninstall the Driver on the Display Device > Driver tab, restart PC to reinstall driver.
You can also try older drivers in Device Manager > Display device > Driver tab > Update Driver > Browse > Let Me Pick.
Then you will know you've tried everything in addition to Windows Update drivers.
Try also these troubleshooting steps for sleep:
http://www.makeuseof.com/tag/fix-windows-10-sle...
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
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