I believe there are also separate flasher modules for the hazards and the indicators, mine did the same about 4 years ago but can't remember the exact fix.
Under the steering wheel, the indicator flasher unit is located there. About $8 from a repco/supercheap. When mine went, it started either flashing stupidly quick or very slow (pretty much got stuck). Throw a new one and itll be good as new!