VNC freezes every minute

[Aenfa]

I have a really annoying problem where VNC freezes for something like 5 seconds every minute. It sometimes even freezes completely where the only way to unfreeze it is to disconnect then reconnect. I know it's not my network connection because it happens even with full WiFi signal and none of my other remote desktop apps have this problem. It also happens regardless whether or not I use SSH. Can this be fixed? I find it really frustrating to use with it freezing all the time and feel that I have wasted my money.