Which firmware are you using DDWRT or Stock firmware.
What is distance between your wireless client and R7000?
Check if the problem exists when using different channel.
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Try R23310, it worked for me with DHCP issues.
http://www.desipro.de/ddwrt/K3-AC-Arm/r23310/
Which firmware are you using DDWRT or Stock firmware.
What is distance between your wireless client and R7000?
Check if the problem exists when using different channel.