File adapter is not consuming files in osb12c

i am trying to consume files from a directory in osb12c, when i change the strategy to singleThread it is not blocking all the files are being consumed but it is slow, if i give it the default strategy , the poller do not poll anything if the number of files is big, and it is inconsistent , sometime it doesn't poll 10 files sometimes it consumes 300 before stopping.

if i increase the number of threads used , the number goes higher but it does not serve if the endpoint gets deactivated.
i keep getting the following in the .out file while not a single file is consumed