check the wiring for the turn signal, and check the fuse also. if anything bring it to a mechanic, or dealer and have them check it out. also, see if there is any recalls on it. just search for _(car name)_ recalls and you should find a place listing them.
Make sure the bulb socket fits tight in the back of the lense.Make sure the bulb fits tight in the socket.Vibration can cause damage to the bulb if these aren't tight.Also look inside the socket.You will see a couple of contact points for the bulb.Make sure they are not burnt or melted.This can cause too much electrical resistance and damage the bulbs. And make sure the bulbs are dry,no water leakage into the lense or socket.Try not to touch the glass part of the bulb with your fingers.The oil from your hand can cause "hot spots" and damage the bulb.
And don't buy light bulbs from WAL-MART. They are no good, nor are autozone ones.
Moisture may be getting into the assy. This will cause a short lived bulb.
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