15 second outage every 6 hours.....right on the dot.

This is not business grade so there's probably no real SLA on this but I'm trying to solve some logs and help figure out which one of the devices is the chink in the chain. Do these timers look familiar? 15 second outage to all external WAN IP's 2 times a day, 6 hours apart, for 15 seconds. Using the cheap builtin mode and started my monitoring to Default Gateway, Specrum Pop, Google DNS to determine if it is inside the network on the LAN. Does this look fairly normal to any service provider?

Net Uptime Monitor Failure Log (NetUptimeMonitor.com)

11/2/2020 4:23:04 PM Log Start

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Failure Start Length

11/2/2020 9:17:31 PM 0:00:12

11/3/2020 3:17:29 AM 0:00:17

11/3/2020 9:17:31 AM 0:00:15

11/3/2020 3:17:30 PM 0:00:17

11/3/2020 9:17:30 PM 0:00:16

11/4/2020 3:17:33 AM 0:00:14

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11/4/2020 7:08:08 AM Log End

Monitor Duration 38:45:02

Failure Summary:

Count 6

Total Downtime 0:01:34

% Downtime 0.07

Minimum Length 0:00:12

Maximum Length 0:00:17

Average Length 0:00:15