Most likely its the combination relay, located just behind the fuse panel in the engine compartment (driver's side). It's called a combo relay because it servers as a relay for a number of functions, including turn signals, hazard flashers, and intermittent wiper operation.

I replaced mine about 4 years ago for around $100.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car