Apple Watch constantly renewing DHCP lease every few minutes

My partner and I both have Apple Watches (Series 3). While checking on my router logs, I noticed that both watches frequently get into snits where they are peppering my router with DHCP lease requests every few minutes, even though the leases they have been granted for 2 days by default. Here's a snip of my router logs showing the two watches repeatedly begging for premature renewal:

Dec 28 10:39:33DHCP Server: 10.88.88.1 assigned 10.88.88.100 to a2:76:d9:74:84:48, lease time 172800
Dec 28 10:35:56DHCP Server: 10.88.88.1 assigned 10.88.88.100 to a2:76:d9:74:84:48, lease time 172800
Dec 28 10:35:56DHCP Server: 10.88.88.1 assigned 10.88.88.100 to a2:76:d9:74:84:48, lease time 172800
Dec 28 10:35:54DHCP Server: 10.88.88.1 assigned 10.88.88.100 to a2:76:d9:74:84:48, lease time 172800
Dec 28 10:35:37DHCP Server: 10.88.88.1 assigned 10.88.88.100 to a2:76:d9:74:84:48, lease time 172800
Dec 28 10:34:16DHCP Server: 10.88.88.1 assigned 10.88.88.100 to a2:76:d9:74:84:48, lease time 172800
Dec 28 10:27:47DHCP Server: 10.88.88.1 assigned 10.88.88.105 to c6:de:69:9c:81:9d, lease time 172800
Dec 28 10:26:42DHCP Server: 10.88.88.1 assigned 10.88.88.105 to c6:de:69:9c:81:9d, lease time 172800
Dec 28 10:26:40DHCP Server: 10.88.88.1 assigned 10.88.88.105 to c6:de:69:9c:81:9d, lease time 172800
Dec 28 10:26:31DHCP Server: 10.88.88.1 assigned 10.88.88.105 to c6:de:69:9c:81:9d, lease time 172800
Dec 28 10:26:25DHCP Server: 10.88.88.1 assigned 10.88.88.105 to c6:de:69:9c:81:9d, lease time 172800
Dec 28 10:26:23DHCP Server: 10.88.88.1 assigned 10.88.88.105 to c6:de:69:9c:81:9d, lease time 172800
Dec 28 10:26:22DHCP Server: 10.88.88.1 assigned 10.88.88.105 to c6:de:69:9c:81:9d, lease time 172800
Dec 28 10:21:17DHCP Server: 10.88.88.1 assigned 10.88.88.105 to c6:de:69:9c:81:9d, lease time 172800
Dec 28 10:20:44DHCP Server: 10.88.88.1 assigned 10.88.88.105 to c6:de:69:9c:81:9d, lease time 172800
...

These little DHCP tantrums occur dozens of times in a day, and sometimes last quite a bit longer than what I've shown here. No other devices on my network have are exhibiting this behavior (at least not that I've been able to detect in the logs).

Any advice on what's going on here, and (hopefully) how to make it stop? It's more than a bit annoying, and wasteful -- and it's clearly unnecessary.... Feel's like when the kids sit in the back seat of the car, and incessantly repeat "Are we there yet?" until someone spins around and threatens mortal harm to them if they don't shut up...