I still have hourly interruptions

I still have hourly interruptions.

i.e. the same MacBook

• When connected directly to the 771 router with Ethernet, observes no connection issues.
• When connected to the 771 router with WiFi, every 60 minutes there is a period of 30-60 seconds when ICMP (ping) to an internet IP address fails.

Other activities, such as viewing video or on-line meetings also pause during this period of time?
Other devices are also affected, but the MacBook is the only device which has an app to record pings and thus document when the problem starts and how long it lasts?