Finally discovered why (for mine anyway)...
I had placed it in a separate VLAN, and my firewall rules were blocking it from pinging the Gateway.
Thanks to stumbling upon https://www.reddit.com/r/HomeNetworking/comments/19cyc1g/comment/kj2tu65/ I learnt that the Wiser Hub wants to icmp ping the Gateway and 1.1.1.1 every minute, and if it fails 5 times it drops off the WiFi briefly. Hence every 6 minutes!
Hope this helps someone else.
Below is the packet capture:
| 17:55:44.275908 | IP 192.168.my.wiser > 192.168.my.router: ICMP echo request, id 7759, seq 29189, length 136 |
| 17:55:44.276020 | IP 192.168.my.router > 192.168.my.wiser: ICMP echo reply, id 7759, seq 29189, length 136 |
| 17:55:44.277885 | IP 192.168.my.wiser > 1.1.1.1: ICMP echo request, id 11521, seq 29445, length 136 |
| 17:55:44.286147 | IP 1.1.1.1 > 192.168.my.wiser: ICMP echo reply, id 11521, seq 29445, length 136 |
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