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odd reduced rpm limit after 30 min run time


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So i have a 99 boxster with the 5.2.2 dme.  the car has a 3.2l box s engine with a 987 airbox and maf sampling  tube.  fairly standard swap.  has headers, 996 throttle body, and underdrives. 

 

I had softronic do the engine tuning. 

 

So for approximately 30 minutes after key on, the engine runs fine, revs to 7300rpm redline with no issues.  after 30 minutes though the car will run fine but it hits what feels like a rev limiter at 6200rpm.  the car will not rev through it, wot or not.  if you pull over and restart, you get another 30 minutes before this reoccurs. 

 

I asked softronic about this and they said the dme programming is not the issue.  i have checked the maf wiring and obviously the maf is plugged in.

 

Any things to check or input would be great.

 

Thanks very much

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