B3 band needs to be adjusted. Unfortunately I don't think that your transmission has an external adjustment screw like the older ones did. IIRC 722.0-722.2 trannies had the external screw. You can try and clean off the valve body which may help get the fluid to the right places more quickly, but if it gets progressively worse I'd say you need a new B3 band which ain't cheap.

Edit: Check out this thread, same issue: http://www.peachparts.com/shopforum/showthread.php?t=99048&highlight=B3+band

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth