connected to Wifi --> sleep --> wake up --> disconnect to Wifi and cannot find any Wifi source
Try disabling MAC address randomization in /etc/NetworkManager/NetworkManager.conf and change it to have this lines:
save it and then run from terminal:
systemctl restart NetvorkManager
It could also be your tlp, which is a power management tool.
NOTE: I am not at all an expert, you could try this until someone with exp replies.
Hi, I have no problems with wake up.
Go to System Settings, Energy Saving and take a look at the end of the section if the Wireless has the default value which is Leave Unchanged.
Hope it help, regards