08 ydre intermittent drive issue

[08YDRE]

First post to this sight. I have an 08 ydre with an intermittent run issue. I pull it out of the garage in forward, I get out, load golf clubs, get back in and press the pedal to go forward and nothing happens! I then switch it to reverse and it backs up no problem! I will then put it back in forward, press the pedal and it continues to go in reverse??? I have switched the tow/run switch and it doesn't affect it. I will then let it sit for a day and go out and it runs fine with no issues??? It has been in the shop at PGA West here in La Quinta Ca for the last 2 weeks and they can not get it to reproduce the problem. The "shop" has said it could be the "wiring harness" or a "switch" down on the pedal?? Don't want to randomly start replacing parts for the obvious reasons and I can't really afford to do that!! Any help will be appreciated! Almost ready to have them bring it back and try and find another shop!!!!