AC1750 Router Logs Showing (nearly) Duplicate Entries

When inspecting this Netgear Nighthawk AC1750 Router's Logs, several (nearly) duplicate entries have me a bit perplexed. The 'Login admin failure' and 'DHCP IP' entries appear one immediately following the other at approximately 20 second intervals. Other than a panty sniffer type living nearby that might get-off on spoofing my device's MAC and IP addresses for whatever reason, (which I fear may be a distinct possibility), what other logical explanations might exist for these occurences taking place? What actions would you suggest? I also found a 'Block Attack' entry that I found to be curious.

According to the router's update feature the most recent firmware is installed: V1.0.4.106_10.0.80 

Below are a few examples of what I'm referring to. Thanks!

[Admin login failure] from source 192.168.1.3, Wednesday, June 01,2020 09:30:11
[Admin login failure] from source 192.168.1.3, Wednesday, June 01,2020 09:29:52

[Admin login failure] from source 192.168.1.3, Wednesday, June 02, 2020 09:39:55
[Admin login failure] from source 192.168.1.3, Wednesday, June 02, 2020 09:39:33

[DHCP IP: (192.168.1.3)] to MAC address XX:XX:21:XX:2X:3X, Saturday, June 05,2021 06:31:52
[DHCP IP: (192.168.1.3)] to MAC address XX:XX:21:XX:2X:3X, Saturday, June 05,2021 06:31:31

[DHCP IP: (192.168.1.3)] to MAC address XX:XX:21:XX:2X:3X, Sunday, June 06,2021 04:45:35
[DHCP IP: (192.168.1.3)] to MAC address XX:XX:21:XX:2X:3X, Sunday, June 06,2021 04:45:13

[Block Attack] From source: 192.168.1.3, port 80, Wednesday, June 02, 2020 09:41:38