"Manage-bde -lock x:" command is not locking my specified drive from today

[ET_888]

I am using windows 10, 64bit. I set up bitlocker correctly and it was worked for four weeks. From today, "manage-bde -lock x:" command is not locking my drive, please note that restarting and locking drive is working properly. I did restart then send command ("manage-bde lock x:") then it locks but second lock command is not locking unlocked drive. How to solve this issue?

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