you have a strange network
- modem at 192.168.100.1 ? Really ? I hope you have somewhere route to this network.
- I can't find 10.53.19.100 in your DNS, meaning you have somewhere on your network one machine that is unknown from your DNS but trying to update zone (BTW, is it the one from where you launched dig AXFR command ?)
- something wrong with the "Samba DNS" ?
If you have renewed your lease, you should see, in DNS, one entry matching workstation IP.
If not, stop looking elsewhere, there is already something wrong at this stage.
Once this one is solved, we can look further but not before.