Why is a specific table becoming un-deletable sporadically?

Question

This is the error that i am getting: -

TITLE: Microsoft SQL Server Management Studio

Drop failed for Table 'dbo.FIST5$'. (Microsoft.SqlServer.Smo)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=14.0.17119.0+((SSMS_Rel).170517-0412)&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Drop+Table&LinkId=20476

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ADDITIONAL INFORMATION:

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

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Lock request time out period exceeded. (Microsoft SQL Server, Error: 1222)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&ProdVer=13.00.4206&EvtSrc=MSSQLServer&EvtID=1222&LinkId=20476

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BUTTONS:

OK