This wallet is the worst I've ever used. It's always lagging, bugging out, etc.
I have over 2500 coins and I try to send them to itself and it says not enough coins. Nonstop issues since the most recent update.
We have run GUI wallets in three platforms (ubuntu, windows and mac) without any issue. You might feel lag while syncing, but it is good after synced. May I know what is the OS and spec of your machine? It could be your machine low hardware spec issue.
I have windows version at i5, running smooth, had made a few deposits and withdrawals without an issue.
I also tried to get linux wallet in vmware ubuntu, transfer my wallet.dat to it, it works great too.