Should you buy a year's worth of hosting at a time?

Should you buy a year's worth of hosting at a time?

Last year, I paid for a full year of hosting on one of my secondary websites. I didn't end up using that site much so the money went to waste. Now I'm just paying month to month, by subscription. Though if something goes wrong with billing and payment doesn't go through, my forum would be shut down until the billing error was resolved. That's happened before, actually. So I'm not sure if buying hosting month to month is any better of an idea. Do you buy a full year of hosting or just pay month to month?