DIAGNOSIS Router is overheating or has a firmware bug causing instability. The R7000 is known to run hot, which can cause thermal throttling and crashes.
FIX First, update to the latest official firmware from Netgear's site, not the betas. Log into routerlogin.net. Go to Advanced > Administration > Firmware Update. Upload the new .img file. After update, do a hard reset via the rear pinhole (hold 10 seconds). Second, ensure ventilation. Place it upright, not flat, with several inches of clearance on all sides.
IF THAT DIDN'T WORK The issue may be incompatible QoS or Traffic Meter settings. Log in, go to Advanced > Setup > QoS Setup. Disable 'Enable WMM (Wi-Fi Multimedia) settings' and 'Turn Internet Access QoS On'. Also, go to Advanced > Administration > Traffic Meter and ensure 'Traffic Meter' is set to 'Disable'. Apply settings and reboot.
HEADS UP Do not use the 'Auto' channel setting for 5GHz. Manually set it to a high channel like 149, 153, 157, or 161 in Advanced > Setup > Wireless Setup to avoid DFS radar interference drops.