Without logs I can only assume you are experiencing an issue with the Transcoder that is caused by a recent Windows 10 Update. Microsoft has released two patches since the update that caused the problem.
Please verify you have the following Windows Updates installed:
July 10, 2018 - KB4338819 (OS Build 17134.165) - which introduced the issue
July 16, 2018 - KB4345421 (OS Build 17134.167) - First fix
July 24, 2018 - KB4340917 (OS Build 17134.191) - Second update Microsoft released fixing issues
