Oh by the way, everytime i have restart the bitcoind, i have to type back in console :
settxfee 0.0002 otherwise the payments would not occur.
To solve the problem with the fees not set up with
fallbackfee that is not installed.
Also the bitcoin-qt.exe in windows, i must start it with
-fallbackfee to make withdraws transactions possible.
IT's no big deal tho

In the bitcoin data directory, there is a file called fee_estimates.dat, my file is about 248Kb. Try opening the GUI qt and sending some BTCV without using
-fallbackfee and set the transaction fee to Recommended 2 blocks. You may need to wait for this data file to grow before a good estimate is possible. There is no harm to continue using the fallbackfeeoption. The price of BTCV is so low that who cares, now if this was Bitcoin we would have to worry about the extra cost associated with using a larger fallbackfee.