Netgear Nighthawk r7000p 5g issues

I recently bought a renewed Netgear Nighthawk r7000p on amazon, the router works great, however there is a minor issue that is quite annoying, I use the 5g daily on my cell phone and tablets to connect to the internet. it seems like this problem happens every 48 hours, I lose 5G connections on all devices, when i look at the available wifi list on the devices the 5G is gone only the 2.4G is there... rebooting the router using the app on my phone fixes this and the 5g returns for another 48 hours...  sometimes rebooting in the app does not fix it and i have to power down the router for a minute then re start it...  any ideas why this is happening? the router i replaced was an asus router and the asus worked fine for 7 years and never did this...