Hey Eliot
Try disconnecting your battery for 10 minutes. The tip adapts and have quite a few shifting maps, or patterns if you prefer. Wouldn't be surprised it only needs resetting. Be consistent with your driving when you'll have it reset & test.
If a mechanical issue (ultra rare btw) you can be sure you'll have a CODE reg. See if you can pull the codes out with a durametric or a generic code reader.
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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