wallets are not broadcasting transaction

[nagagaga]

Hello everyone,

I have a testing altcoin network, which is very unstable.
running on 3 nodes, qt wallet on ubuntu and windows and android.

my qt wallets always send with an error,

0/offline, has not been successfully broadcast yet.

sometimes it works some times it don't.

the moment i try sending a 1000 coins, works! while it still having confirmation, i tried sending another 1000. It shows 0/offline.

i tried different platform to sent

Ubuntu >> windows

Windows >> ubuntu

android >> windows

Ubuntu >> android

out of 6 transaction, only 1 succeeded broadcast to the network

I check out my server nodes, by using getrawmempool

it shows

[
]

which is nothing but still fails to broadcast a transaction.

Any advise on this issue?