1st, your battery is telling you something. Why is it at 75% charge? I would replace it
If that doesn't solve the issue then everything you are having issues with is classic signs of an immobilizer issue. You could send it, dme & keys off to ecu dr for testing & fixing & repair or look for a used immobilizer, dme & keys...or have dealer put a brand new one in & program it.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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