Hiya est,
Wipers can be tricky.
Generally speaking when any "device" suddenly (and suddenly is the key word here) stops working, the cause is almost always electrical in nature. Pull the plug and the device simply stops. So, I'd definitely agree with the above postings - check fuses and contacts.
But also know this.............wipers can stop working in short order due to friction in the pivot shafts. This stoppage may not be as abrupt as no electricity, but such stoppages can be darn to close to happening "suddenly". What happens is this.......... the shaft that your wiper blades are bolted to runs through a hollow brass shaft. This is the wiper pivot shaft. It needs to be well lubricated in order to allow the internal shaft (the one the wiper arm bolts to) to move freely. If the lubrication inside the wiper pivot shaft is not attended to on a regular basis the internal shaft can bind up solid.
Should you find no electrical reason for your wiper stoppage, go to Plan B and check to make sure the pivot shafts are well lubricated.