Transaction not confirmed

Hello People!
I post my problem with Ledger wallet nano s and also i post my solution for that but my problem is not solved totally!

https://forum.zcashcommunity.com/t/ledger-nano-s-sync-problems-with-zcash/14015/12
this was the solution to get my coins back!
IO get them back on my zcash4win wallet about 21 zec but after that i start to transfer them to exchange and almost all was ok!In some reason i can not transfer all in one time so i start in smaller amounts 1 zec 1 zec 2 zec 3 zec 5 zec 5 zec until i not send all!And almost all i receive at exchanghe address only 5 zec not confirming !I try to delete wallet.dat file and import private ki again and my zec is again in wallet,i try to send it again and the same thing

you can see the screenshot https://www.dropbox.com/s/lrfkt4f1s7d0t63/Transaction%20not%20confirmed.png?dl=0

i try this many time!
Interesting is that first time when i check my transaction was here
https://zec-bitcore1.trezor.io/address/t1QYmLtUjDxYAL1uRR8VyYaVtjELz2zS2NY and write not confirmed but now it is gone!

I try one more thing i send one zec back to this address so now i have 6 there but also cen not send out any!I mean i can send but nothing confirming!After i make delete wallet.dat and importing private key i have the amount of 6 zec again on wallet but i can not do nothing with them!

Any idea?