There will be a KB article released soon that concerns any customer that migrated to LAS on an SDX appliance recently. You will need to ensure that you also removed the physical license files from the GUI and that the .lic files no longer exist in the '/mpsconfig/license' directory. If these still exist, appliances are going in to an unlicensed mode. I will link the KB article once it is published.

I might have the same problem. SDX says it's licensed, but after about 24h it's falling to grace, again. I can re-license the bandwidth, and it's licensed again (for another 24h, so grace starts again)

Strange. Do you see the license server as "Reachable"? I have a customer with a VPX pair that are showing like they cannot reach the Agent.....

Jep its green and reachable, very strange indeed