You might try going to the Network and Sharing Center, Local Area
Connection Status-Details and see what might be going on there. Check
it when you have your connection and after it quits.
Compare all the settings to see if you have lost your IP addresses or
something else. I don't know what would change the lease time from the
normal 24 hours, but make sure yours shows the 24 hours and not 24 minutes.
In that case you should only use your computer for 24 minutes. Power it
down, wait a few minutes untill the CPU cools down then use it for another
24 minutes.
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