Stuck in queue

I've been using SmartFTP for long time. However, at least for the last couple weeks every time I transfer a file or files, it's oftenly got stuck in the queue. I have to abort the process then start it manually. I tried to be patient but now I'm fed up because it's just too often. If it's just once in a while it's still ok. Now it's becoming very tedious and annoying. I need help if there is any setup that I can do to prevent this from keep happening. I do not want to upgrade to 4.0 because my maintenance period has been long expired and I can't spend more money just because of this. Below is the system info of my SmartFTP:

+- System -----------------------------
Microsoft Windows Vista Home Premium Edition
Service Pack 1 (Build 6001)

CPU Speed : 2194 MHz
Total Memory : 2045 MB
Free Memory : 1111 MB

+- SmartFTP ---------------------------
Version : 3.0.1026.18
Time Stamp : 2009-03-09 16:16:52
Platform : x86
Id :
Days in use : 1117

+- Application DLL --------------------
sfFTPLib.dll :
sfFavorites.dll :
sfFavoritesShellExtension.dll :
sfTransferQueue.dll :
sfFTPShellExtension.dll :
SmartFTPPS.dll : 3.0.1026.18

+- Language ---------------------------
SmartFTP.exe : 3.0.1026.18

+- Internet Explorer ------------------
Version : 7.0.6001.18000

+- Winsock ----------------------------
Winsock : 2.2

Version 3.0 has been discontinued and is no longer supported. Sorry.

Version 3.0 has been discontinued and is no longer supported. Sorry.

Not a good practice of doing business. You force your customers to keep buying your product not because they need it, but because of the error of your product. It seems I will have no choice but to go with xyz.