Mac Mini sleep issue

New mac mini here. When my mini goes to sleep by itself and when I awake it the the internet safari hangs. I either have to reboot or put it to sleep and awake it again. Im using wireless and have an external hard drive connected.

I did the SMC already. Didn't know if i needed to do a PMU because im new to Mac. I did however eject my external hard drive and then let the mini go to sleep on its own. I woke it up and internet works perfect now. So its my seagate free agent ext hard drive 1.5tb. It was formatted to nfts and recently formatted to Mac os journaled. I need my external plugin usb because my itunes and movies are on there. Is it not compatible with mac. Or does it have something to do with Mac putting the drive to sleep and how does that affect the internet hanging??????

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