Rev Limiter At 2500 RPM with UpRev

squib

This issue has happened to me about 5 times since getting a new UpRev tune back in August. The situation that it happens with is when I get off interstate and pull to the stop sign my A/F ration drops to around 10 I notice, then when i take off from the stop sign the ratio goes back up to around 13 but I cant rev past 2500 RPM. I check all the gears and cant get anything past. So I pull off the road and turn off the car, wait a minute, then start again and everything is fine and normal. I have read about fuel starvation, but all I am doing is slowing down after getting off the highway with no turns, and my gas tank never gets lower than halfway between 1/2 and 1/4. I have the UpRev cable, but dont have any idea of what to do to change anything with the tune. Does anyone have any ideas what would cause this, or know what settings would need to be changed with the tune? I have tried disconnecting the battery to reset the ECU, and I still got the limiter after. I cant take it to Nissan either because they told me before that because of the UpRev everything is changed and they wouldnt know how to work on it. Any ideas or help is appreciated. Thanks!

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2010 370Z Base + Sport Black 6 Speed Stillen Supercharger, Custom UpRev Tune, GTM 25 Row Oil Cooler, Mines Y Pipe, Saclam Exhaust, Tein Mono Flex Coilover, SPC Front and Rear Camber Kit, Goodridge Steed Braided Lines, Custom Painted Headlights, Tint