My lens gets stuck when I press on. Then it says lens error. I have to fiddle with it for a while before it rectifies. What do I do?

Often a sign of underpowered or near dead batteries. Often, when you purchase batteries in bulk, it isn't uncommon that some or many of them are near dead or worse. Batteries bought in bulk tend to have a long turnover and such, can lose much of their battery power before they are used. And many batteries such as AAs are general purpose batteries and are not designed for the high energy use of digital cameras and the flashes they trigger. As such, I recommend using high energy batteries designed for digital photography. Varta is a good brand. They are usually sold in camera shops, are long lasting (because they are sold in small quantities) put out alot of energy.

At the very least, make sure you are using Alkalines.

If turning it on and off many times doesn't clear the error, then try and recreate it with the AC adapter. if that works, you know it's the batteries. If not, it's repair time.

Be advised, however, that if it's out of warranty, it may cost more to repair than it is really worth. The rule of thumb is that if the estimate for repair is north of 50% what you paid for it, you're better off taking that money and buying a newer and upgraded model.