Couple of PCs don't get scanned automatically and patches cannot be deployed.

Couple of PCs don't get scanned automatically and patches cannot be deployed.

Hello,
We have couple of machines that do not get scanned automatically after couple of days after a reboot. I see that machine is live, I can remote into it, but if I deploy a configuration it doesn't go through (it has "ready to execute" status).

The only way to push the configuration is to reboot the machine. And again it will get scanned and pull configuration for a couple of days and then will get stuck again. 

I tried clicking  "Apply configuration" from the agent on the problem machine and reinstalling the agent, didn't help...
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