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Transmission goes berserk at normal operating temp

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99 Boxster Tiptronic - Runs fine when cold on first startup every day. I only drive it around town in stop/go traffic, and after about 20-30 minutes the transmission starts jerking, awkward hard upshifts and downshifts (sometimes no shifts), then the gear lights start flashing.

I was thinking that since it shifts fine when cold, the transmission probably is not totally shot, but not sure where to start on fixing the problem. Could it be as simple as low/burnt fluid?

Engine is throwing codes P0446, 1124, and one for an oxygen sensor, and I know what these are but not thinking this is related to these transmission symptoms.

Anyone know what this could be?

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Duramtetric only says unknown fault codes 72 and 75 on the transmission test.

P0732 Gear monitoring, 2nd gear - signal implausible

P0735 Gear monitoring, 5th gear - signal implausible

Possible causes:

ATF level not OK

Mechanical/hydraulic fault in transmission. (Valve chamber)

(e.g. solenoid valve does not operate despite - Transmission correct electrical triggering)

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