Entire left side turn signal wont flash
 

Hi everyone,

i have a Mazda 2 2008, and my entire left side turn signal just stays on when i use it and wont flash. It takes about 15 seconds for all 3 bulbs ( Front, side, and back) to turn off which is a problem when I'm driving as it it confuses other drivers. It also happens when i lock/unlock the car.
This problem rises randomly and every time i take it to a mechanic, the problem does not occur and they cant find what the cause is.
I've taken my car to Mazda and they couldn't figure the problem out without seeing it happen, so they reset the computer. Unfortunately, it is still happening every few weeks and I dont know what to do!
Any help would be much appreciated

Maybe the indicator relay?