Boot loop when pushing image from WMS

Has anyone ever experienced a boot loop when trying to push an image from WMS? Basic process is this:

• Select new thin client (already registered in WMS).
• Push new image.
• Client receives the job and counts down 2 minutes.
• Instead of booting into Merlin and pulling down the image, the client boots back into Windows.
• Client will then attempt to pull the image again and reboot, not into Merlin, but into Windows.
• Wash, rinse, repeat.

Cancelling the job does not stop the boot loop process.
The only way to stop the loop is to unplug the network cable. However, as soon as it re-connects, the job starts again and the boot loop starts all over again.

1. How do I keep the process from starting all over again? I cancel the job in WMS, but the client continues to try to pull the image.
2. How do I prevent this in the first place? I have a feeling that either the client isn't pulling an IP quick enough, or if it is, it cannot communicate with WMS.

Here's what I've tried:

• After registering the client, update WDA to 14.4.3.5, then try to push an image. This did not work.
• When in a boot loop, image the client using USB drive. Once that process completes, even though the job is canceled in WMS, it reboots after the Sysprep process completes and pulls the image successfully. I can't wrap my mind around why this works. The only difference between the image I'm pushing and the stock image is that WDA is updated, I installed 2 programs, and set power options. That's it.
• We auto-register our clients via DHCP entries.
  165 WMS - https://FQDN:443
  166 MSTT - FQDN:1883
  167 CA Validation - FALSE
  199 Group Token - defa-Def@ultPolicy1

I'm at my wit's end with this. It worked fine last week.