I run the bitcoin client 0.17.1 on my ubuntu 18.04 desktop. I have some balance in my wallet. Also my client is fully synced.I have face the wallet conflict. When I send multiple transaction at once(without time gap). Happen two things.
Some transaction is confirmed and completed successfully
Some transaction is stay on the memory pool for a long time. And the status is show as
0/unconfirmed, in memory pool
If I send transaction with some of time gap, no problems is existing. Also I mention that I already used
bumpfee RPC. But transaction stay on the unconfirmed stage.
Note: I give the proper fee for every transaction