anybody have any suggestions I have 04 F250 had since new n turn signals intermittently stop blinking i have already replaced switch

 

There is a signal light flasher under the dash to the right side of the steering column.
A wise move would be to try to locate it while it is still clicking or it can be quite a challenge to find. It is usually a 7 prong electronic flasher. Once you locate it , just change it, since there isn't much sense going through all the trouble to locate it only to replace it later. That should correct the intermittent signal light problem. You might purchase one first and it might help you to find that object under the dash.