We decided to add back our original alert when the Internet is re-connected. I think it will help solve this issue.
Could you see if this helps?
You may try to disable the power management feature in network adapters:
a. Click Start
b. Right Click Computer
c. Click Manage
d. Click Device Manager in the left window pane
e. Expand Network Adapter.
f. Now you will see your network adapter or adapters if you
have more than one. Right Click on network component and click
Properties.
g. Go to the Power Management Tab.
h. Make sure all boxes are unchecked.
i. Once you’ve unchecked the boxes click ok and restart your
system. Put the computer into sleep mode and check if you still have
issues.