My wifi drops off after computer sleep

After computer sleep~ 1hr or more, can’t access internet, WiFi icon in menu bar says I’m connected.
Network diagnostics gives me error message: “Network Diagnostics wants to access key: My network name in your keychain, do you want to allow access? I hit “Always allow” , then I get message : “Network change detected- do you want to proceed”, I hit “yes” and WiFi is restored.
What I tried to fix it from calls to Apple support and what I read on line:
1 Start over from scratch- remove all internet PW’ds from keychain, remove network from Network preferences.
2 NV RAM reset
3 turn off Firewall off
4 Set service order
5 SMC reset
6 Remove System Configuration folder
7 Renew DHCP lease
8 Remove Bluetooth Preferences file.
Nothing has worked.

Wireless Diagnostics - About
Troubleshooting Wi-Fi issues in OS X
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