Galaxy Tab 3 not detecting Wifi

I have a Samsung Galaxy Tablet (SM-T230NU) running Andriod version 4.4.2. I have a newly installed router in my apartment. All was working well for 3 weeks (after the new router was installed) and then, on Sept. 5th, my wifi was no longer detected by my Galaxy Tab. It detects the other wifi in the building (the entire building is serviced by the same internet provider and the entire building has the new routers), but not mine. The tablet still functions properly on my work wifi and at cafes. The only router it seems unable to detect is the one in my apartment. That router works fine with all other devices (my phone, my laptop, my chromecast) and hasn't had another problem. Troubleshooting steps that have not been effective: restarting the router, restarting the tablet, factory reset on the tablet at home, factory reset on the tablet at work. Help please.

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