Is there a solution to my laptop charger issue?

I have had a toshiba laptop for three years now. About a year after buying it, the battery charger suddenly stopped working. I bought a new one and it worked for a while again. The battery died a year later, so I bought a replacement. Again, it worked fine for a while, and I still haven't had issues with the new battery. About two years into it, I had to buy another charger. This one came almost exactly a year after the first one died, so I thought it might be an annual tradition (right during midterms, so perfect timing); however, in May of this year my battery charger died again, and I had to buy another replacement. This came just 7-8 months after the last replacement. Now the replacement I have has stopped charging my laptop. I've had issues with the chargers before, so I'm not sure if it's the laptop itself having issues or the charger is malfunctioning. It's a Kensington and there's a light which shows that there's current flowing through a little light-up beacon right before the plug into your laptop. I don't know why I'm burning through chargers so quickly. Can anyone explain this to me? And how can i fix it? II want to avoid getting a new laptop, but Three chargers in a year seems like a little much - is it time to just give up? Thanks for helping.