So nominally, this is a 24h lease.
But just 5 mins later, it is getting a sigterm and releasing the lease.
I don't know why this is happening, but there are two possible situations.
- I found this, but I wouldn't expect it to affect your system.-
- Are you using a standard release build downloaded directly from OpenWrt's site?
- is the physical link bouncing?
- what happens immediately before the udhcpc sigterm in the logs?